The morning after returning home, Kris climbs through the window into their room, and puts the SOUL inside themself. They go downstairs and meet Toriel, who was drunkenly partying with Sans. Toriel apologizes to Kris for having made too much noise the previous night, and is given some honey toast to eat. Kris heads outside soon after, seeing multiple residents, from QC to Pizzapants, and even their father Asgore, setting up for the upcoming Town Festival, in which everyone will be celebrating together, having stalls and games of their own. Asgore in particular talks about how he plans on selling his flowers so that he can pay off his debts to Carol Holiday, so that he can get his old job back. With several roadblocks of crates belonging to the town residents strewn across the streets, Kris is railroaded straight to their school to Castle Town.

Upon entering Castle Town, Ralsei arrives to meet Kris, informing them that Susie is already in the castle preparing for her first date with Noelle. They can go around Castle Town to meet various Darkeners that they've recruited setting up residence, if they had been recruited before, and even meeting the Mikes. Depending on whether you let Tenna stay in the last chapter or donated him to Nobody, there will be dialogue showing Small Mike, or Battat interacting with the other Mikes, who will rebuke Tenna for his "contracts" if he stayed, or will feel aimless if Tenna is gone. Kris and Ralsei press on into meeting Susie, who is getting some clothes to wear on her date with Noelle, with Queen and Lancer's help. The player can create a custom outfit with Lancer's help, akin to how the Thrash Machine was made, which is then printed out by Queen, who also keeps it on hand just in case.

Leaving the Dark World, Kris and Susie return outside the school, where Noelle has arrived. Susie makes small talk with Noelle, leaving her flustered. Together, the three go around town during the Festival, where they can interact with various town residents. Purpleguy, who's working at a dunking game, Napstablook and the Wet-Nose Bandits running a Test Your Strength game, where Susie and Noelle have to hit simultaneously, the Librarby Bird, who is selling octopus (with Onion curiously missing), Noelle's father Rudy, who's out of hospital and helping with the decorations, while Carol is down south, Sans, who is running a ferris wheel, teacup ride, and selling ice cream simultaneously, Pizzapants, who is trying to reveal his "girlfriend" Pizzarina while at the Holiday residence, where he learns the truth, and Asgore, who is selling flowers, which he offers to Kris's friends. The Town Festival is also having a Festival King and Queen, who will be selected through ballot vote, as per Catty Cattenheimer's father, mentioning how Asgore and Toriel were once the King and Queen a long time ago, with Asriel as their Prince.

As the day goes by, the gang visits the beach to eat their ice creams together. Late that evening, Kris has fallen asleep while Susie and Noelle have a romantic conversation. Despite Carol calling Noelle on her phone, Susie helps Noelle find her footing, telling her to stand up for herself. They go near the beach to watch the sunset. A daring Susie walks into the shallow water, inviting Noelle to join. She simply picks her up in her arms to go out into the water, to get a better voew. Here, Noelle confides to Susie how things have changed ever since they met, admitting how she was afraid and wanted to run away from Hometown, but felt braver thanks to Susie, who admits that she is happy to have been her friend. Thus, they admit their affection for each other, as the Town Festival announces the Festival King and Queen, so they decide to go back.

While Susie leaves to get more ice cream, Noelle collapses in amazement, realizing how she and Susie are becoming a thing now, and feels more flustered that a half-asleep Kris might've been listening in. Noelle's phone rings again, with her mother Carol calling. To her shock, Noelle is informed that her dad Rudy has "fallen down", so she rushes to see him. Susie returns with ice cream, but is told by Kris that Noelle's gone. They go back, passing by Asgore's flower shop on the way. Susie decides to stop by inside, while Kris suddenly removes the SOUL from them and stashes it in a nearby trashcan. They draw out their knife to try and open another Dark World, only to be interrupted by Susie, who comes out with a bouquet of flowers for Noelle. Kris discreetly enters through the back door and opens the Dark World inside Asgore's flower shop, catching Susie's attention. Realizing that Asgore is inside, she calls Kris to go in, and Kris arrives after Susie enters, pulling the SOUL out of the trashcan to put back inside, just as they enter their new Dark World.

Kris and Susie land into a grassy patch inside this Dark World, which is strongly reminiscent of the Card Kingdom in the first chapter. While walking through the grassy field fpr a while, Susie catches sight of Asgore across in the distance, who is talking to a strange figure. An anime-esque styled character named Flowery, who introduces himself with a fully animated sequence, and an old friend of Asgore from times gone by. While Susie is left flabbergasted from meeting him, Asgore is happy to meet Flowery, and decides to go out with his friend, forcing Kris and Susie to follow him. Along the way, they find Ralsei in one of the closets they pass by, who explains that Flowery locked him inside it, sparking enmity between them. The three then meet Flowery proper, with Ralsei making known his umbrage of Flowery, especially after Flowery forces his green hat from the first chapter on him, with the intention of making him look less recognizable to Asgore. Regardless, the gang set their sights on sealing the Dark Fountain, knowing that the Knight could easily come and kidnap Asgore.

The gang then travel through the Dark World, which reveals its oriental aesthetic, thanks to the familiar-looking Garden of Hopes and Dreams transforming into a cherry blossom forest. While travelling, the gang spot Flowery with Asgore nearby, doing various things together, such as fishing in the pond, and watching a cowboy show, reminding Asgore of his child Kris's hobbies when they were little, while the gang solve various puzzles. They encounter Flowery again while at a locked door, leading to him very briefly joining the party to help open it, giving them a watering can to help grow paths with unlimited water, and grow flowers for the garden clippers to shear a path. They eventually discover a large torii gate, which gives them the ability to run at top speed, helpful in crossing a waterfall without drowning. There, they meet Flowery and Asgore again, in a diner, where they converse about how Asgore once had an interaction similar to this before, with Flowery giving him orange juice and some music to listen to, while the gang receive some root beer, which Susie eats/drinks. Also in the Ideal Diner is the chef, Green, who sells stuff to eat and drink, and Yellow, a cowboy.

The trio then leave the Diner by heading rightwards, where they find more running puzzles with torii gates, trekking around them carefully. They find more puzzles to solve, similar to the ones in their first outing together, but a later puzzle to open a nearby door requires an extra person for help. While Ralsei wants nothing to do with Flowery, Susie decides to find him regardless for help, and he agrees, to Ralsei's frustration. Rather than giving an extra hand, Flowery simply solves the puzzle himself by skateboarding across the buttons. A nearby Asgore is impressed with his skills, though admits that he would be more happy with his son Asriel. Flowery agrees, but takes Asgore with him on another skateboard. The gang continue through the open door, where they meet Flowery again, who speaks to each of them, before guiding them to a shortcut leads back to the Light World. Of course, they won't go until they have sealed the Dark Fountain and taken Asgore with them, but Flowery assures that he'll be alright, though the party say otherwise.

With Flowery gone, the trio continue past the exit, but find a passage that they cannot climb. They travel back the other way to a garden on the other side of the large lake, which turns out to be the backdoor to behind the counter at the Diner. They continue going through the back, where they then find two other Darkners arguing about protecting a "feather". They are the purple Seth, and the cyan Aqua, working with Flowery. Sure enough, they spot the Fun Gang nearby, so Aqua, who is the younger of the two, confronts them with a "game" to play. After a tough boss fight that involves knives a plenty, Aqua accepts defeat, and at Susie's request of a trophy, lets them take the feather behind her. In go the trio, sliding down from the garden into where a shrine housing the feather lies. Despite being unassuming, Kris takes the feather, which causes a wind that adjusts everyone, giving them the ability to jump high, as well as shifting the perspective of the game, going from a top down RPG to a side view platformer, giving the heroes the ability to jump anywhere, and Kris to utilize their sword even more. They can also ACT with Susie and Ralsei's help, who can break certain objects and become platforms, respectively, with wardrobes enabling them to access their inventory. After platforming a bit, the gang meet Aqua again, whom they thank for the Feather, while she reveals a new "enemy", a Bullet Pattern, which can be destroyed with no consequence. The gang also use the mysterious objects that they had found earlier, which can switch perspectives when struck, transitioning between either platforming or top down.

After getting the Petal Feather, the gang continue travelling the other way past the exit, where they find a beanstalk right ahead, and look up. They see Flowery and Asgore once again on top, looking at the flowers that are in each others' images. While talking, Asgore asks a question that surprises everyone, asking Flowery about the Dark Fountain in the Flower Kingdom. Confused, Flowery agrees to take him there tonight. Down below, Susie gets angry with Flowery doing such a thing, that they follow him by climbing using the Feather, hitting a nearby trigger. Thus, the gang climb using the leaves as stepping stones, with Susie and Ralsei's help, eventually reaching the top, where the Cliffs are, and the Dark Fountain far-off coming from within a castle. Asgore and Flowery are also there, discussing what to do next, going to see the Dark Fountain. Before they can go on, Susie comes forth to interrupt. Asgore is shocked to see that Kris has come, while Flowery uses his powers to float Asgore away to the Flower Castle off in the distance, where the Dark Fountain is. Susie gets furious, telling Flowery that they should get him out of the Flower Kingdom, as the Knight would come soon. Flowery however, tells Kris that their father doesn't need them anymore, telling them to go home, despite Susie and Ralsei's protests about the Knight, who could kill Flowery, who has decided to protect Asgore. The gang remain firm on their word; Flowery announces that so will he, warning the gang that he will fight them if they have to, before teleporting away. With no way to go but Flower Castle, Ralsei decides to use whatever time is left to head there via the Cliffs, since the Knight hasn't yet arrived.

The gang begin to climb their way through the Cliffs, and jump across the flower platforms, getting blown back up by the updraft of wind if they ever fall. Along the way, the trio hear Aqua and Seth above them, who have an argument on what the former was supposed to do, due to them being forgetful, much to the latter's frustration, especially when Aqua tries to pick her own name, causing much trouble for Seth, who wants to keep their human name. While discussing what kind of Darkners they are, Ralsei explains to Susie that they are the manifestations of the seven flowers in Asgore's attic, with Aqua and Seth being the cyan and purple ones, yet they want to be human. Jumping and running further, they land right beside Seth and Aqua again, who talk about Asgore wanting the perfect home, with Seth wanting to help Asgore as well, but they are forced to hide when the Fun Gang land. Despite Ralsei assuring that there's nothing to feel worried about, Aqua agrees to help by telling them where Asgore is, at the Flower Castle, which only further infuriates Seth, who decides to fight the gang with a Bullet Pattern, which they easily defeat, even with Aqua's help. After getting defeated, Seth and Aqua run for it, though Seth trips on the way, and is helped by Ralsei. While continuing, Susie suggests that the Seven Flowers aren't inherently bad, since they want to help Kris's father Asgore be happy.

They continue scaling the Cliffs, stopping by another Shop, trying to follow Seth and Aqua, catching glimpses of them whenever they are close by. They ride some more floating flower platforms to get across some large gaps, by helping blow them into place by striking some leafy pinwheels to create drafts to move them. Getting up and above, they climb some more with the help of some Umbrellas and Netskies, all while avoiding the garden clippers from before that cut their vine ladders. Eventually, they arrive at one last stretch of torii gates, where they see Aqua and Seth in the distance. Naturally, Aqua and Seth spot the Fun Gang, so Seth orders Aqua to use her knife attack. Of course, there's also another pinwheel in the room that the trio strike, which creates a gigantic updraft that sends them floating through a long section dodging Aqua's knives (and Seth's wallets), reaching the top of the Cliffs, right below Flower Castle's entrance. The trio continue up, where they find Aqua and Seth, having escaped the Fun Gang, or so they think, as they are now trapped without a way inside, especially since they lack the Petal Feather, which Aqua gave to the heroes, much to Seth's fury. They turn up front and center, to which Seth tries to explain to Aqua the difference between friends and enemies, which she miserably fails at. Regardless, they both decide to fight a boss battle. The trio try to spare Seth and Aqua, but to no avail, as Seth is aware of what they're trying to do, while Aqua makes tons of knife attacks. Thankfully, Aqua gets bored of repeating the same attack, deciding to try something new, accidentally hurting Seth, before leaving. Seth tries using more of their own attacks, but they suffer a big breakdown after failing, with Aqua taking them away not helping, ending the fight. With the purple and cyan Flowers gone, the heroes press on to the entrance of Flower Castle, where they find another exit to the Light World, but they know better.

However, despite them bypassing the exit, Flowery appears once again, telling Kris and Susie that it's better for them to leave Asgore alone, so that he can have the perfect home and family he has always wanted. Despite this, Susie tells him that they have to get Asgore out regardless, arguing that it's not what he wants. To this, Flowery calls Asgore to come out, wearing his golden suit of armor and purple cape. He is again shocked to see Kris and Susie, and forces them through the exit whether they like it or not. Back outside his flower shop, he kicks them out and locks the door. Susie tries to break and enter, but realizes that if they did, the darkness would likely spill out, alerting more people, putting them in danger as well. Fortunately, Kris tells Susie about the back door (which they had previously entered to open the Dark Fountain), and Susie goes in with Kris, none the wiser. They land back inside the Flower Kingdom, straight inside Flower Castle. Unfortunately for them, Flowery had anticipated their arrival, revealing that they landed in the Castle Jail, which he locks them inside. Fortunately, it turns out that Aqua is trapped inside with them, and when told about the "game" they're playing, she is excited to help them escape, considering Susie her friend. As usual, Seth passes by, shocked that Aqua is inside, demanding that she comes out. But when asked to pick between them and Susie, Seth opens the cell regardless, not wanting the wrong answer. Before Kris leaves, they speak to Seth, who not only knows that Kris made the Dark World, but asks for something before leaving—Berdly's feather. Though to their chagrin, Aqua locks them in the cell, wanting to "play".

After they escape, Kris and Susie find Ralsei, dressed as a butler, feeling irritated with Flowery. In any case, the trio continue up and out the Jail, right into the Foyer of Flower Castle's interior, with the Dark Fountain up top. They travel eastward, through a Zen garden, then spot Asgore once again with Flowery. He is cutting notes hanging by red ribbons to harvest. Asgore reveals that after finding proof about his past, he fully plans on finding the one who opened the Dark Fountain, to make them pay painfully for having ruined his life, hoping that he can be with his family again when everything is back to normal, after clearing his name. Flowery tries to assure him that he doesn't need Toriel, asking how she treated him, and Asgore realizes it. Susie and Ralsei are curious about the notes that Asgore is collecting, and while platforming, the gang find more Bullet Patterns, in the form of blue roses and yellow guns. Indeed, they pass by two doors of the same colors. Going further left, they find more similar colored flowers, and another large revolver Bullet Pattern that fires bullets. After destroying it, they find the yellow key to open the yellow door, but before they can take it, they are stopped by Yellow, the cowboy who was last seen at the Ideal Diner. He makes it clear that he won't let anyone hurt his lover Blue, after the gang destroyed his Bullet Patterns. Despite being held at gunpoint, the trio manage to gaslight him into thinking that they weren't the ones who did, and it was him, since they aren't humans. Feeling glum, Yellow decides to leave after letting them have the key. Unfortunately, it's revealed to be a "punishment" way, so they go in to help him, just in case. Inside, he admits to burying himself alive, much to Susie and Ralsei's horror. They go around the Zen pond to rescue him, all while getting various pieces of "evidence" on Yellow's home turf. After reaching his hat, they try to "dig" him out, not realizing that he hasn't yet buried himself, but they did dig a hole for him. Thankfully, they convince him to not do so, and he leaves, but goes north into another "punishment" way that's worse, apparently. In they go, where they meet Seth and Aqua trying to build a rollercoaster, to blow up Yellow. The trio try to follow them, dodging a suicidal Yellow's patterns, going past more blue roses, and finally find him tied to a target with Aqua's help, planning on blowing himself up. Thankfully, they destroy the Punishment Gun, and Ralsei and Susie convince him to not hurt himself over his failure. He agrees, but chooses to go back to Jail, with Aqua joining him.

Following their encounters with Yellow, the gang travel left some more, where they arrive at what looks like a dining room in front of a theater stage. Kris, Susie and Ralsei slowly take their places, wondering what's going to happen, when they meet the flower Blue, a ballerina. He speaks to the gang in a calm and diligent manner, hoping that they can be friends, and makes clear that he won't try and stop them from fulfilling their task. While giving the blue key, he also expects Yellow to show up, but is surprised and confused when he doesn't. Not knowing what to say, the gang lie their way out of it, leading to Blue going back the way they came to find Yellow. The trio follow Blue, who finds various clues left behind the depressed Yellow, such as the remains of the Punishment Gun, his large hats, and his punishment hole where he tried burying himself. The trio also find several other clues, such as a book, red stains, boot oil, and more, before catching up to Blue by entering the other blue door beside the yellow one. They finally find Blue talking to Yellow behind bars, with the former trying to help the latter get over his "crimes", assuring that he did nothing wrong, but they soon figure out who was behind it all—the Fun Gang try to sneak past the lovers, but are caught easily. Blue then figures out that the trio gaslit Yellow into depression, and thus begins the next boss fight between them. This time, Yellow is holding a courtroom trial for multiple unsolved cases, having the other Flowers besides Flowery as suspects. Using each of the objects selected as the "evidence" from earlier, the gang manage to thwart several cases, namely Seth flattening a Floradinn, Green dirtying Yellow's corn shirt, and Aqua using red food coloring as fake blood to dye Blue's handkerchiefs. The last case turns out to be Blue stealing Yellow's super secret petals for his performance, having left behind his blue string, which he confirms, much to Yellow's shock, ending their fight. Yellow is so shocked by his "crime" that he tries to end him with his gun, but Blue disrupts him, assuring that he is better than he thinks of himself, giving a bouquet made from the flowers he stole. Thus, the couple decide to end their fight peacefully, while Blue requests the gang to not try and trick Yellow again, wishing them a goodbye.

The fight over, the trio proceed, stopping by some hot springs, where Blue comes to help Susie get flowers for Noelle. Kris and Ralsei wait, soon meeting Flowery again, pissing off Ralsei as usual. He makes it clear that they will be sealing the Dark Fountain regardless, though he asks if whomever made their Dark Fountain is really bad, which shocks Ralsei. Having nothing to say, or Ralsei not wanting to say anything, Flowery leaves. Kris and Ralsei continue, finding a nearby onsen that they get into. While relaxing, the two talk about various things, namely the Dark Fountains, where Ralsei expresses his worry that there shouldn't be any more of them, as the overflowing darkness would trigger the Roaring soon. He also addresses how Kris was able to play the piano so well, something that he tried but couldn't get it right. He confides how that he'll stick with Kris until the end, no matter the path they take. But, their conversation is interrupted when Susie arrives and takes a dip in the onsen, thinking it to be a swimming pool. They all get out and continue, where Ralsei explains exactly what kind of Darkners the Seven Flowers are, being manifestations of organic beings rather than inanimate objects, and they won't be safe in the Dark World.

The trio proceed, returning back to where they started in the Foyer of the Flower Castle, where a topiary statue of Flowery hanging from the biceps of two Asgores is blocking the way. The gang use some shears hanging nearby, which cut a way through. They then go rightwards, entering the Castle's Flower Cafe, where they can watch or be a part of optional "breaks", which are encounters between various characters, namely the six Flowers besides Flowery, showing some unseen characterization. They proceed more to the right, dealing with the Terakota guards along the way, in addition to dodging more of Aqua's knife attacks, while Seth is working on a story to tell Asgore. Following their ordeal, the gang stop by again where Asgore is, who has finished collecting all of his documents and notes, about the Dark World. Flowery is also there, noticing Asgore's shock and fury, because he is trying to read through the notes, which have jumbled up words and letters, causing him much unneeded trouble. He refuses Flowery's attempts to help, until he blows away all of Asgore's papers, with Flowery telling him to let go of his old family, so that he can stick with the Flowers as his new family, as Seth, Aqua, Green and Yellow come to read him a story. Asgore decides to take a break then, going with the Flowers. As for the gang, they find some of Asgore's notes, which they can't make anything of, but Ralsei notes that it's about the Dark Worlds, one of which opened a long time ago, which makes them wonder just how long they've been around.

The gang find another puzzle, where they adjust platforms that are only visible and tangible when behind the papery sliding doors and walls of Flower Castle, reaching high enough to get the orange key to open the orange door nearby. Inside, they hear someone talking, and they see a shadow forming on the paper walls, who claims to be another Flower, Orange. She makes it clear that she will protect Asgore, but is baffled to meet the three "humans", thinking lowly of them, but Ralsei isn't too worried. Orange gets angry, deciding to show what she can do, summoning boxing glove Bullet Patterns. Though Kris is able to easily strike the boxing gloves and send them flying to punch a hole in the paper. Despite being easy, Orange warns them of what's to come. The trio climb some more, where they bust open more paper walls with Orange's boxing gloves, and get to the top, much to Orange's anger, who threatens to tell on them. They finally arrive at the Second Diner, which Flowery had mentioned before, spotting Asgore leaving Seth to do his work. Seth gets shocked once more to meet the Fun Gang again, realizing how Orange had been hiding around again. So they summon another Flower to stop the gang, Green, the chef. They appear from another room, introducing themself and making clear that they will stop the trio, but instead draws out a pan to give cheese, which they happily eat, thanking Green. Seth, who had been sitting nearby gets beyond irritated by Green's failure, even more when a shortcut back to the Flower Cafe is opened.

The trio follow Seth through the door Green came from, solving more puzzles involving finding disguised Netskies, and dodging more of Aqua's knife attacks from behind paper walls, all while getting some intangible platforms active, as Orange in the background gets furious. They finally meet Seth and Aqua for another Bullet Pattern fight. Seth makes their glasses invincible and keeps Aqua at bay, remembering how they failed because the trio could ACT, causing much trouble. Fortunately, Orange tries to "help" by launching her boxing glove Patterns, which Kris easily deflects to break Seth's glasses. The resulting explosion causes the paper walls that Orange was hiding behind to tear to shreds, revealing that she was merely a small mouse Flower rather than a humanoid. At least, Orange thinks she is human, but the gang feel rather amused, especially Ralsei, who doesn't take her all that seriously, even after she does some rapid punches, causing barely as much a scratch. Orange leaves in a huff, promising to get stronger. Regardless of what to expect, the Fun Gang follow her outside and right into another large hot spring on a bridge, where they find Orange again. Upset at being "bullied", she tells them on Green, who has to bear their arguments, before they get dissapointed. With nowhere else to go, Orange decides to follow the trio, but upon remembering that Flowery told them to stop the gang, she immediately works with green to stop them, beginning one more boss fight. Throughout it, the trio heal themselves from Green's cooking and try to socialize with Orange and Green as much as possible, though Susie nearly ruins the fight at the last minute. Thankfully, after seemingly winning, Green and the trio congratulate Orange for her victory, who are all impressed with her efforts, though they still accidentally make her cry and run away because she misinterpreted her words. After the fight is over, the trio head back, but Green arrives to tell Susie about a cookie recipe for Noelle, while Ralsei decides to pray for a bit, wanting good to happen in the end, though Flowery appears again, telling him that no matter what happens, he should stay strong, and have faith in himself. The trio regroup and return back to where they started, the Foyer.

In the Foyer, the gang activate the shears that were out of reach on the right side of the room, which snips away the topiary sculpture of Flowery and the two Asgores, making a clear path. Opening the door that was behind the hedge makes a gigantic watering can fully accessible, being carried to the tiny sprout that was present. The trio then water the tiny seedling, which then grows into a huge beanstalk. Kris, Susie and Ralsei climb right on up, passing by the various other Flowers, all being ignored by a despondent Asgore. Upon reaching the top, with the rooftops outside, the Seven Flowers regroup together, wanting to make Asgore happy, having been trying to do so. Flowery goes to meet Asgore, who is looking despondent, but announces that he will go to the Dark Fountain, and find the one who made it, with a grim path in store for them. Flowery agrees to send him there, while the gang arrive to meet the Flowers. However, Flowery comes to reveal the trio's plans of sealing the Dark Fountain, ending Asgore's perfect world. Despite all their efforts to be friends, the Seven Flowers decide to fight the Fun Gang anyways, leaving one by one. Flowery leaves last, pointing out that his friendship with the Flowers is much stronger than what Kris has, expecting to see them at the Top of Castle. With no other option, Susie decides to follow Kris to the end, and go on out to the Top of Castle.

On the Castle rooftops, the Fun Gang begin the last stretch of their journey to the Flower Kingdom's Dark Fountain. They climb using the slingshot flowers from before, fight more enemies sent out by Seth, who has improved their attack formations, Yellow and Blue working together to attack from the background, and more. On the way, they meet Flowery again. He makes it clear on no uncertain terms that the Seven Flowers only want nothing more to make Asgore happy with their Dark World. Ralsei warns him of the Roaring if they keep the Fountains open, so Flowery asks a poignant question—why don't they close their Fountain that makes Castle Town. Ralsei is taken aback, but Susie insists that it stays, because of how important of a home it is to many people, but Flowery decides that it matters not, noting the kind of "hero" Susie is. Nonetheless, they refuse to be put down and continue, then running across a long stretch via torii gates, dodging Aqua's knife attacks. They meet Flowery on a long staircase, in which Ralsei tries to prematurely attack him, but Flowery effortlessly dodges, asking him why he'd waste his time like this. Ralsei reminds him that he is a Darkner, not a human, and they have certain "rules" to follow, otherwise things go bad. Flowery, realizing that he went too far with messing with Ralsei, decides to ask what he wants, which leaves him more speechless. Susie cheers him up, and they continue, meeting Green on the way, who makes it easier for them to buy items with their shop.

The trio arrive in another large room on the rooftop, with more flowers to strike and launch from, and more places for Ralsei to hang. At first, the player is prompted to use Ralsei and Susie through ACTing, but it becomes apparent that there is very little room for error. Fortunately, Susie and Ralsei decide to help Kris voluntarily instead of waiting for their directions, and from there, their abilities become more automatic, allowing for easier progression. They rapidly climb up, dodging the shuriken Bullet Pattern coming their way, and make it to the top. Though, they get menaced by the shuriken Bullet Pattern again, which Ralsei destroys with a lethal fireball projectile, much to Susie's surprise. Proceeding, Orange arrives, announcing the arrival of the rest of the Flowers, bringing Aqua and Seth together, then Blue and Yellow, who all attack with their own Bullet Patterns. Orange tries out one last attack, which is easily deflected. After defeating the Flowers again, Green arrives to give some health, and the trio continue to the end. In they go to face the boss of the chapter, Flowery. He tells Kris, Susie and Ralsei that the Fountain is right up ahead, but warns them that they either have the choice to change fate, being the Heroes, or they can let their fantasy persist. They affirm their decision to fight. Flowery then explains to Kris about the Seven Flowers' origins—they were flowers bred by their father Asgore to be a proposal bouquet for Toriel. They weren't meant to last long, but Asgore sought to keep them alive and raise them, which led to them wanting to repay him someday. Even after all the tragedy he faced, losing his friend, family and job, he still cared for them, influencing them to create a world where they could live as long as they wanted, giving Asgore everything in return for his kindness, giving Kris a last chance. The trio step forward, with Flowery seeing that they want to fight, but claims that he and the others will be the true heroes, getting all the recruited Darkners that they met for their combined power. Thus begins the final boss fight.

It's the Fun Gang versus the Seven Flowers. Flowery starts off alone, but he brings in a new formation the trio least expected; a new SOUL Mode, Orange, which acts like Shooter Mode, but launches the SOUL forward. Being an inverse of the "blue stop sign" from a long time ago, the player is prompted to zoom and launch multiple times whenever anything blue arrives, to gain more TP and avoid getting hit. Flowery makes things complicated by bringing in the other Flowers in their respective pairs. Aqua and Seth. Orange and Green. Blue and Yellow. Every single pair helps out Flowery, using all their attacks throughout the adventure, to outsmart the trio. For the last part, Ralsei tries to take the fall, and is put out of commission for the rest of the fight by Flowery. With Kris and Susie alone, Flowery affirms his allegiance, promising to stop them no matter what. They keep on going. Luckily, Susie has an idea—since all the Flowers have been exhausted, she realizes that she can get Kris to the Fountain. Distracting Flowery momentarily, she throws Kris high up, and they climb the thick beanstalk, striking more of Flowery's attacks and outrunning some spiny vines, and finally thrusts to the highest stretch of the Flower Kingdom. For the last section, all the Flowers merge with Flowery, creating Omega Flowery, for a running battle. Kris continues striking, until they make one final power strike, knocking out Flowery for good.

Despite having lost, Flowery isn't going to give up yet. They demand an unconscious Kris to get up and continue. But, before they can do so, Asgore comes up running, shocked to see what has happened. Realizing that Flowery and the Flowers were fighting Kris, Asgore is upset, because of what he let happen to his child, while he was obsessing over the Dark World. Luckily, Blue arrives with his rainclouds to heal everyone, and Kris is alright, to Asgore's joy. Though, his happiness soon gives way to remorse, as he apologizes to Kris (and by extension, everyone else) over what happened. He then tells Kris about his past—ever since the "horrible incident" that led to his downfall, all he ever wanted was to set things right, proving his innocence. He had blamed the Dark Worlds for this incident, but upon visiting it, he realized how much time he wasted, remembering how them, Asriel and Toriel, his family, never blamed him for what happened, but Asgore's self-hatred consumed him, which led to Toriel leaving him. He felt that if he could prove that he was right, it would likely fix everything, but alas, even after finding proof, he still managed to drive them away. He apologizes to Kris for everything, accepting that his family is better off without him, especially them and Asriel, then expresses how proud he is of Kris, for having become stronger and braver, and made friends like Susie and Ralsei. He decides to let them seal the Dark Fountain, much to Flowery's upsettance, after everything they had done, but Asgore reveals that he was only pretending, having understood what giving so much unsolicited affection feels like, and reminds him that he has a flower shop to care for. Flowery relents, wishing Kris, Susie and Ralsei goodbye. Kris then meets the other six Flowers one by one before leaving, saying a last goodbye to each of them, as they somehow revert back to being flowers, dying for good, but still happy to have fulfilled their dreams.

With only the Dark Fountain remaining, the gang visit Kris's Fountain, meeting Flowery and Asgore, who voices his plans of informing the mayor, Carol Holiday, about the Dark Worlds, to prevent more people from being kidnapped. Kris steps forth and seals the fountain, and all seems fine... but it looks as if they are still in the Dark World. To Ralsei's horror, a second Dark Fountain has been made in a different part of the Flower Kingdom at the exact same time that Kris sealed theirs. Sure enough, the Roaring Knight comes along and kidnaps Asgore. Flowery, as a last ditch effort, goes to rescue Asgore, using their inflated stats and attacks to cause an extreme amount of damage to display, but the Knight simply forces the numbers to zero. Despite locking blades in the end, the Knight ends the battle by bisecting poor Flowery. The trio catch up to him, where he is lying in two, near death. Despite Ralsei's healing magic, he explains that he will die soon, because the Flowers are neither Darkners nor Lightners, as rather than being inanimate objects, they are organic beings brought to life by the Dark Fountain, requiring regular water and sunlight, which is inaccessible in the Dark World, capable of understanding certain feelings other beings cannot, but warns them of an unfathomable amount of Darkness underneath the town, which the Flowers have been able to feel in their roots. He assures them that no matter the dark path ahead, there's still a glimmer of light inside them all, hoping that they will succeed in the end. Despite his regrets over being seemingly useless, Ralsei assures the dying Flowery that he still gave Asgore something to take care of in the end, giving him a purpose. And so, Flowery gets to die happy, becoming a flower with a broken stem. With nothing left to do, Ralsei asks Kris and Susie to seal the Knight's fountain, while he stays with what's left of Flowery.

Kris seals the Dark Fountain, with them and Susie back in Asgore's flower shop. Noticing that the yellow flower is damaged, Susie rushes to get something to help, while Kris searches inside Flowery's container. They find some seed packets and one of the codes to the shelter (0915199X). Kris tries to tear it into to shreds, to prevent Susie from reading it, but is interrupted by Susie's return with tape, who then snatches the code from Kris, having the first step to opening the Shelter to save Undyne. She then tapes Flowery together, forcing Blue and Yellow to share a container. While leaving, Susie tells Kris something that Flowery told her—how Asgore was previously the Police Chief, having kept his Shelter code buried within Flowery's soil. With the Festival long over outside, Susie is upset that they couldn't prevent Asgore from being kidnapped by the Knight, knowing that more and more people will eventually get taken. She has something important to tell Kris, requesting them to walk her home. But, rather than being anywhere else in Hometown, it turns out to be the school, specifically their Castle Town Dark World. On the way there, Susie talks to Kris about what a great team they've been, ever since they began their adventures, them and her, being friends only, their "thing". However, as she points out, because of how high the stakes have gotten, with many people being in very real danger, it can no longer be just theirs, as they have to tell the truth soon, deciding to include Noelle, her lover, as well, since she likely knows the Shelter codes. Entering Castle Town, Susie wishes Kris a good night, before leaving.

Following the Chapter's credits is an additional sequence. Susie lands in the Dark World, meeting all her friends at Castle Town, who work towards decorating the place and expanding it, to welcome a new guest—Noelle Holiday, who will not only learn about the Dark World, but get a room of her own to live in it. As Susie goes to sleep, Ralsei comes to leave some cake beside Susie's bed, while Kris, whose motives are still shrouded in mystery, back in the Light World, returns to their home, or even parts unknown, ending the Chapter.

Upon climbing the Cliffs just before the Flower Castle, the Fun Gang encounter a shop, in which a mysterious Darkner named Rose resides. They are staring outside the window to watch the sunset, having many useful items, one of which is a MysteryKey. However, unlike other items that can be bought with Dark Dollars, POINTs or Flower Coins, this particular item requires a rare currency called Pink Coins. The gang then travel throughout Flower Castle, breaking several pink catbells hanging out wherever they go, finding at least ten of them. After they find enough, the gang return back to the Shop, where they meet Rose again, and buy the MysteryKey, leaving her for the door. After completing most objectives in the Flower Castle from defeating the other Flowers and get to the Top of Castle, the gang continue through, passing through a room in which Susie and Ralsei automatically ACT. After getting to the top, they can take the optional path to the left, jumping across more gaps using slingshot flowers, dodging more bullet patterns, and creating updrafts to slowly float to safety.

They finally land right next to a large, pink door, which the MysteryKey can open. There's also an optional path back to where they began on the Top of Castle. Getting close by, the door opens, and in they go, awaiting the Superboss. Out of nowhere, Orange appears, planning on fighting, having been training real hard. While Ralsei is confused, Susie decides to give her a fight, which Orange does not take well, going off to tell on them. The trio follow Orange, finding her in another room, where she angrily announces that she will tell on them to Pink, her older sister. Ralsei expresses annoyance, but Pink soon reveals herself, a Mew Mew protagonist, identifying herself as one of Flowery's Seven Flowers. Orange is happy to see her, telling how the trio had been "bullying" her, which annoys her. Pink tells the gang to apologize, which Ralsei is at first annoyed, but Susie makes him, assuring that they can be friends. Pink then makes Orange apologize, telling her that she needs to learn temperance. Everyone makes up with each other, seemingly on better terms...

That is, until Susie realizes that Asgore doesn't actually have a Pink Flower, remembering how they dealt with seven Flowers on their way. Susie is doubtful, while Orange presses Pink into telling the truth, as it becomes clear that Pink is not actually a flower, but the Mew Mew figurine that Asgore had as his store mascot. She suddenly loses her temper, calling out the Fun Gang for not seeing her as a Flower like the others, being in a Dark World, but Susie and Ralsei point out that they kind of have to seal it. Pink has had enough, deciding to "apologize" with a boss fight. It begins, where she introduces a new SOUL Mode, the purple soul, or Trap Mode. The secret boss fight begins, where Pink/Mew Mew is depicted as a virtual idol, with an audience of possessed Dummies everywhere. As the fight goes, the protagonists are encouraged to Flirt with Pink so that she can be spared, filling up her Doki-meter, arriving at a high school dating sim section, which shows Pink fighting from the inside, as it seems. Continuing to fill up her with more Doki soon reveals the truth—Pink is in fact a Ghost Monster, the Mad Housemate, possessing Mew Mew, who is a living doll in the Dark World.

Both Mew Mew and the Mad Housemate struggle to maintain the same body as Pink, before they finally split apart, revealing their true identities, after filling their Doki meter twice. The trio continue to flirt with them, after finally filling the Doki meter full, causing Pink's body to malfunction. This soon causes Mew Mew and the Mad Housemate to fight some more, but their infighting weakens them immensely, with the Fun Gang continuing to flirt with them, but a third date changes everything. Pink suddenly takes on a form that makes them extremely unstable, with another date forcing the player to avoid selecting negative options, collecting more hearts to pick positive and encouraging options, to keep them safe. With the battle resuming as normal, Mad Housemate and Mew Mew separate, the gang continue flirting to fill up the Doki meter, enabling Pink to have one last date with both her sides—Mad Housemate tells Mew Mew that they were afraid of being flirted with, and wanted a body all for themselves, but couldn't move in it. Mew Mew forgives them, coming to terms with the fact that they can't be separate, and thus reunite as one, on better terms, as Pink.

Thus ends the battle, with Pink thanking the trio for their help, confirming that she is the Mew Mew doll that Asgore kept as his store mascot, which Mad Housemate possessed for a body, but couldn't even more corporeally, until Kris made the Dark Fountain and Flower Kingdom, turning her into what she is now. She becomes distraught when Ralsei explains that they need to seal the Dark Fountain soon, otherwise the Roaring will happen, as is Orange, who calls them out for "bullying" them. Luckily, they offer Pink the option to move to their Castle Town, which she is happy with, but it means leaving all the other Flowers. Pink promises to be with them until the end, and goes. Before leaving, Pink has a talk with Kris, with Mew Mew and Mad Housemate's personalities briefly speaking through, giving them another Shadow Crystal, the fifth one, which irritates Mad Housemate, but Mew Mew is still happy, and they say their goodbyes. Following the end of the battle, the trio can meet Ferroll, who will let the gang know how many more Pink Coins they can find, and enter another room behind them, where the six Flowers are selling some of their overpowered equipment (most of which are items from Undertale), which can only be bought with Pink Coins. Blue wishes them another goodbye before the trio leave to finish their adventure.

If the Weird Route was pursued in Chapter 4, the opening is changed to show a red pixel, followed by Noelle saying "Thank you". We then cut to Kris lying in bed – Toriel calls up in concern, revealing that Kris was asleep the whole day and missed the Festival. The player must mash inputs in order to force Kris out of bed, and once they are up, Kris walks slow and is struggling to resist the SOUL while refusing to provide flavour text when examining objects. Ignoring the honey toast Toriel made for them, Kris leaves the house and runs into Susie, who tells them that Noelle is waiting at the beach; However, while she already saw everything at the Festival with Noelle, Susie is still willing to go through it again with Kris.

The player is able to explore Hometown, see the empty stands and rides, and enjoy some moments together with Susie, before they eventually head to see Noelle. Susie hangs back to wait for Sans to make some ice cream sandwiches, but before leaving, she assures Kris that she cares about them just as much as Noelle and thanks them for being able to spend at least some time together. Kris then moves on to the beach, where Noelle is staring across the lake waiting for them. She tells Kris that when they put the Thorn Ring back on her, she had a terrible feeling that the two of them were going to be dragged down to somewhere horrible, but she isn't scared anymore — she actually wants that to happen.

Noelle expresses that ever since Dess disappeared, she's been stuck in the same routine, forced to be the same timid doe for year after year to the extent that she feels disconnected from herself, and all she has ever wanted is to do "something crazy". Descending into mania, Noelle praises Kris for managing to change themself and break free from their own monotonous routine to become more "interesting", believing that she's the only one who notices their weird behaviour because everyone in Hometown refuses to acknowledge it. After telling Kris that casting SnowGrave made her feel stronger than she ever had before, Noelle briefly acknowledges how horrible her revelations are.

She then goes on to figure out that so long as "Kris" commands her to, she can do anything. Noelle decides to finally do something "crazy", and tells Kris that she wants to see the other side of the lake – something that they, Asriel, and Dess had all wanted when they were younger – before taking Kris' hands, and telling them to command her to get across. Kris and Noelle then begin walking towards the water, with the player being given a series of dialogue choices to either "Stop" or "Proceed". Choosing either option gives the same result: Noelle wills the two of them to proceed, while telling Kris to stop hesitating and that they chose the path they’re going down.

Each time an option is chosen, Kris and Noelle will walk further and further into the water, until they are eventually completely submerged. Once both Kris and Noelle's faces are underwater, the screen will gradually fade to white as static plays, unless the player chooses "Proceed" to advance further and reset both effects. Noelle will speak through her thoughts, urging Kris not to stop and to continue going, even as they begin to drown and the fade to white gets faster and faster, along with the dialogue box turning red and the jingle that plays with each confirmation getting distorted.

• If the player doesn't answer "Proceed" fast enough, the screen will suddenly cut to black as Noelle remarks that she was wrong: the Cyber World was a dream, Kris didn't change, and she was just getting carried away. The game then immediately cuts to the Normal Route version of the lake scene, with Susie carrying Noelle in her arms, but the latter is despondent throughout the whole thing: nothing will ever change, and she will never be able to change herself. Afterwards, the Weird Route is (seemingly) aborted and the game goes on as if Chapter 5 was begun on the Normal Route, albeit with some subtle references to the damage done.
• On the other hand, if the player manages to keep answering "Proceed" even as the screen fades to white and nothing but the SOUL is visible, the game eventually goes silent, lingering on a white screen for several seconds before abruptly cutting to black. The game then shows a CRT screen with the text "Insert Chapter 7 Side B", before booting the player back to the chapter select screen and deleting their Chapter 5 save file (while secretly making a special Completion FILE).

Insert Chapter 7
Side B