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1
Undertale: Am I Playing Sans? 传说之下：我扮演sans了？
(Transmigration + OOC + chat group) Wait, how did I become Sans from Undertale? The System floating in the air answers all his questions. And from the very beginning of his transmigration, he’s thrown into a hell-level challenge. After completing it, he must travel to different parallel worlds under Gaster and the System’s supervision. (Worlds completed so far: Original, Horror, Dust, Swap, KTT, and Insanity)
822Reads7.3Score114Shelves
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Undertale: A Journey of My Own 传说之下：属于我的一场旅途
What is set in stone cannot be changed. All we can do is accept it. After dying suddenly in an accident in his previous life, Heripons transmigrates into the world of the game Undertale! But as the price, he loses some of his memories. Guided deliberately by Frisk, the game's original protagonist, he manages to reach the Pacifist ending and recover some of the memories he lost. He thought he could only go on living in someone else's body and appearance, but an encounter planned long in ad
1.3kReads8.7Score172Shelves
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Undertale: Her Journey, His Echoes 传说之下：她的旅途，他的回响
(This is the author's first time writing, so the prose may not be very good. Feel free to discuss the setting, but please don't bring your personal headcanons into other works.) This book is also known as Undertale: This Human Is Adventuring Again Today I'm not good at writing synopses. Please head straight to the story. After the multiverse arc begins, the romance will be different from what came before, including the blurb. When he woke up, Ze Peng found himself on a mountain. As he walked for
709Reads6.6Score—Shelves
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As UKB: Seriously, Why Is the Multi-World Prosecutor Still Chasing Me? 化身UKB：不是，多审还在追我
"No System, not invincible, few tearjerkers (because the author isn't very good at writing them either)" AU title: [Undertale: Karma Fire Samsara] (Suitable for casual play, not too exhausting.) Li Yuan stayed up all night grinding CTT, then died suddenly along with his computer. When he woke up, he had become Sans. But the player here didn't seem like a good sort. After twelve consecutive failures, the timeline went a little haywire on the thirteenth attempt. A secret beneath the cliff. A stran
491Reads6.7Score—Shelves
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Honkai: Star Rail: How Is This Skeleton So Strong? 星铁：这个骨头架子怎么这么强
“Seriously, Sans, can you take this seriously?” “Ha ha ha, March, you should know skeletons can fall apart.” (After being utterly destroyed by Sanb 114,514 times, an overworked office worker went out to clear their head, only to get hit by a runaway truck and end up in the world of Honkai: Star Rail. They awakened a System that lets them become a different judge every day, then set off on a wonderful adventure aboard the Astral Express.) A friendly reminder: You may want to go through the story
488Reads6.6Score100Shelves
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Jujutsu Kaisen: Sukuna Is My Dad? 咒术回战：宿傩是我爹？
Please don’t read this book. It’s an embarrassing relic from my past, especially awful, and some of the weird, absurd stuff in it is best avoided! Seriously, beware! (◍–ᴗ–◍) If you do read it, please try not to leave comments. It’s just too embarrassing, OK?
2kReads8.7Score199Shelves
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UT: I Joined the Bad Time Trio to Fight a Green-Tea Bitch?! UT：我上邪骨团打绿茶？！
[Undertale] [UT] [Undertale] [Bad Sans Crew] The female lead has no romance. Side pairings include ErrorInk, MustardKetchup, NightmareKiller, and MurderHorror. The female lead comes from a derivative AU of the Blossoms Fade AU. She isn’t kind or saintly, and the backstory has been changed somewhat. The story is mainly about the female lead being selected by the System and joining the Bad Sans Crew. She half-heartedly helps deal with a suspicious little green tea who seems to have the crew’s skel
149Reads6.8Score—Shelves
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About My Love for an Oil Octopus 关于我喜欢一只石油章鱼这事
[Complete and signed] [Just an embarrassing old work] Nightmare otome It’s already an embarrassing old work (looks away)
122Reads8.2Score—Shelves
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On Having a Negative Soul in Undertale, Right 论负面灵魂在传说之下这件事，正
(The author may not be very good at writing. Feel free to discuss any questions about the setting in the comments.) A soul arrives in a game world. He has no idea why he came here. All he has is the name Ming Chen, along with memories of the world of Undertale that appeared out of nowhere in his mind. Ming Chen: “I don’t know why I came to this world, but I just want to protect it, and the people who love me!” Frisk: “Ming Chen? Mm… very good! Except that you never take the initiative when it co
42Reads—Score—Shelves
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Chara: A Glitch in the Undertale Timeline chara传说之下错乱时间线
By chance, in an unexpected shower of starlight at a comic convention, she was chosen by a terrifying bolt of multicolored lightning. And so began a wondrous adventure in Undertale. Reincarnated as Chara in a chaotic timeline full of uncertainty, she was bound to a "salvation" System and created a UT chat group. Across the multiverse, she journeys and embarks on adventures!!!
—Reads—Score—Shelves
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Undertale: I Transmigrated into the Hypocrisy Route from the Start 传说之下：开局穿越伪善线
Bai Ye, who had terminal cancer, closed his eyes as he lay dying. When he opened them again, he had transmigrated into Undertale, but something about this world felt wrong... There are elements absent from the original, and events are veering off the original plot. The butterfly's wings beat faster and faster, and Bai Ye, a transmigrator, must risk everything in a desperate fight for the fate of the entire world! “For this world!”
131Reads6.6Score—Shelves
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Undertale: Blossoms That Never Fall 传说之下：永不飘落的繁花
(No CP + SF + HE + Upholding RightE = ?) In 201x, at Mount Ebott, Crow heard that no humans who went there had ever returned. So, with a missing-person flyer in hand and a bow on her back, she went to investigate. She saw Frisk trip over a vine and fall into a deep pit, so Crow jumped in after her. After freeing the Underground, Crow thought she had reached the end. But with Flowey’s prompting, she found Gaster and struck a deal with him… She would go uphold justice and grow stronger, while Gast
24Reads—Score—Shelves
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UT Fanfiction: The Golden Legend UT同人：黄金传说
Frisk accidentally falls into the Underground. Just as she thinks she is about to meet her end, she gets help, but the one who comes to her aid is a monster from legend. An Undertale fanfic with an original AU. Sans x Frisk. The AU is called Gold Tale. Updates are irregular, but it will never be abandoned.
23Reads—Score—Shelves
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Nightmare Is Busy Again Today Nightmare今天也在忙碌
Updates are irregular for now, with each update being at least 1,000 words. Also, the author is terrible at coming up with names, so the chapters won't have titles. (All right, really, I just want to be lazy.) Please don't blame me if my writing isn't very good. (I did warn you in the title, after all.) The characters might be OOC at times. I'll try to stick as close to the original characterization as I can, but I'm not their mom, so they might not always be completely in character. Also, if so
173Reads—Score—Shelves
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Ghost Wants a Peaceful Route ghost想要和平线
[Undertale fanwork] [Some original headcanons] [No pairing in the main story] The main plot follows Killer!Sans's official comic, and has currently reached the multiverse. Hi, I'm Ghost. I'm a ghost~ Right now, I have absolutely no idea what strange world I've fallen into. But that's okay! I can't remember anything anyway. I don't know whether forgetting is a good thing or a bad thing. I don't know. I sincerely hope it won't be long. So, Sans, go back to sleep for a little while. It'll be over s
971Reads8.4Score104Shelves
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UT: Deviation ut：偏差
[Undertale derivative + heavily altered setting + OOC + Nightmare gets put through the wringer + no romance in the main story, I love platonic pairings!] If everything deviated from how it was supposed to be, if everything changed, I think I’d say that we are not redeemed, we are not forgiven, and we don’t need the judgment of bystanders, because we are simply ourselves. (This blurb is a mess, don’t mind it.) This story came from the author’s frustration with the original Dreamtale setting and
278Reads—Score—Shelves
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Everything Began with a Mistake, but When Will It End? 一切从差错开始，又到何时结束？
After everything went wrong for the protagonist, he transmigrated to Error Tale, but he didn’t fully merge with the body. His negligence led to everyone in his world perishing, so he decided to travel to other worlds and help the skeletons who were suffering.
19Reads—Score—Shelves
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Undertale: A Colorful Illustrated Tale 传说之下：缤纷绘卷
The heart of color pulses between ash and faint light, on a land woven with determination and dust, a traveler with a unique “colorful determination” quietly appears.
14Reads—Score—Shelves
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The Business of Bone and Shell 骨壳商途
The Underground Sales Pitch of a Skeleton In this Undertale AU, [Legendary Salesman of 1997] Spamton swaps [bodies] with a [skeleton], but instead of landing in trouble, he smells [the opportunity of a lifetime]. He chooses the fiery [skeleton brothers] as his partners, repackages his obsession with [capturing humans] as a business venture, and starts preparing a [Human-Capturing Training Camp]. He turns the [spaghetti stand] into a storefront and promotes his own brand. With absurd marketing,
22Reads—Score—Shelves
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Undertale: Links of Hope 传说之下：希望的链接
“If you could start over and do the same thing again and again, would it mean anything?” “I don't know... I don't know if I still have the passion to do this.” “I just think it's fun...” “Tch... I think you just want attention...” “You!”
1Reads—Score—Shelves
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Undertale: The Story of an ULB 传说之下：一只ulb的故事
Give him one molecule of oxygen and he'll dance until the world ends. He is the fearsome ulb. General of the Army Douglas MacArthur, speaking from far away on the surface, once said, “If God told me to defeat ulb, then God himself would have to join the battle with a real sword.” Asgore, king of the Underground, also said, “From the moment I appointed ulb as judge, I knew I would never see another slaughterer again.” Frisk, humanity's ambassador for peace, said, “After ulb's trial, I never commi
225Reads7.1Score—Shelves
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Becoming Error 成为error
An Undertale AU fanfic, mostly based on my own headcanons, not canon. About a certain skeleton who decides to become a destroyer. Due to circumstances beyond my control, an official pairing was added later. It doesn't appear in the main story, only in the extras. But after signing the contract, I couldn't change the tags, ugh. Everything the protagonist does comes from his own heart. Whether good or evil, it's his own choice. No pairings in the main story. [The protagonist doesn't consider hims
1.7kReads8.7Score108Shelves
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Genshin Impact: A Journey Through Teyvat’s Dust 原神：尘埃的提瓦特之旅
[The author only wrote this book out of boredom, so the writing might not be very good.] A white room, A painful memory, A determination that will never die, A madman? A wondrous adventure, A chance to atone, A loyal friend. And so this adventure begins...
104Reads—Score—Shelves
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Undertale: A World Gone Wrong 传说之下，错误的世界
A System that had just passed its evaluation couldn't wait to find its first Host. A Judge who had just experienced an era of peace. Everything seemed to fall perfectly into place, but it was all just part of “his” plan.
42Reads6.5Score—Shelves
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Killer Doesn't Want to Move killer不想动
[Undertale AU fanfiction + No romance + Dual protagonists + Dual personalities + No System] A crossover with my previous book, Transmigrated as Horror, set in the same world. Also known as I Became Killer's Other Personality. A soul from another world merges with a soul in pain. Sharing their memories allows them to trust each other. Along this long and painful road, will they find redemption, or fall into the abyss... “I long for peace, but fate always pushes me toward a different path.” “P
1.5kReads8.9Score134Shelves
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Undertale: The Slaughter Cycle 传说之下：杀戮轮回
(AU setting changed.) After staying up all night and suddenly dying, Lin Fan transmigrates into the Underfell fan game he designed, Underfell: Kill or Be Killed. Facing the mad monsters he created, Lin Fan's only way out is to follow the game's route and leave the Underground...
37Reads—Score—Shelves
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The Fall of Twilight: Beneath the Aurora 暮色之陨：极光之下
Maybe... if the war had never broken out back then, we would have had better lives. When the aurora blankets the world and monsters endure their days in pain, who will step forward to change everything? No... It's all in vain. When the last bit of warmth vanishes from the midst of malice, revenge can no longer be held back. With golden light by their side, is it a blessing or an ill omen? And behind the or
83Reads—Score—Shelves
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Undertale: Infection and Redemption 传说之下：感染与救赎
(Adapted from Plague Inc. and Undertale: Infection and Redemption) The end of the pacifist route, the beginning of a new life. Interests clash, and even the innocent are not entirely innocent. The epidemic strikes again. Who can stay out of it? With lives on the line, who harbors ulterior motives? "Some things can't be explained by science, just like monsters." Let it all be a long dream. A friend passes away, how tragic. The savior's sigh, how despairing. Why not take this chance to meet once m
51Reads—Score—Shelves
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Undergoodluck
[Undertale fanfiction] [Amateur writing (._.)] [No System] [The main cast are all native AU characters] [Any resemblance is purely coincidental] A human child named Clover falls into the Underground. Lucky Clover survives the fall and begins a strange and wonderful adventure through this bizarre place... After exploring the Underground comes a journey through the multiverse. Our AU has no ending!! Main cast: my original character Luck Sans, my OC Clover, and Dust!
59Reads—Score—Shelves
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Undertale: I Forge the Perfect Ending! 传说之下：我！完美结局铸造者！
(Toxic-content warning: There is a female lead, neither lead is particularly strong, there are other transmigrators, some details involving time travel are inconsistent, and the pacing is slow at first. If you can accept all of that, then let’s begin!) AU name: LD! Undertale Lin De accidentally transmigrates to the world of UT! To reach an even more perfect ending, he travels through time and space, stepping outside the grasp of the unseen hand behind the scenes, all to understand the truth of t
277Reads8.7Score—Shelves
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National Fate: Sans Can Dominate Even While Frail 国运：sans即使病弱也能横推
Sans takes part in the National Destiny game. No transmigration plot, but there will be AUs. I’ll do my best to capture Sans’s personality and avoid making him OOC. Sans is the strongest fighter in another world. A fragile mage with infinite magic. No System, no CP, survival game. There will be viewing-room segments where secret identities are exposed. I started writing this because I wanted to write a power fantasy. I changed the cover. I drew it myself. I didn’t have time to change it before b
544Reads8.1Score100Shelves
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Raising a Wyrm, Starting with Hollow Knight 从空洞骑士开始饲养沃姆
[UT + Ace Attorney + Hollow Knight] (The story has reached the Silksong arc.) Chu Xin transmigrates and is forcibly drafted by a System to complete missions in various worlds. The System gives her the superpower to resurrect, but it only works on bugs. Wait, is that the Pale King, Wyrm, who just came out of an egg? Ace Attorney doesn’t even count as a low-martial world. It’s practically... Hold on, do I have a Black Psyche-Lock? One little knight from Undertale can sweep through the whole place
988Reads8.9Score113Shelves
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A Monster from Undertale: Sans 来自传说之下的怪物：sans
After arriving in the Undertale timeline and becoming Sans, he gains the power of Causality Code and puts a stop to the player’s genocide run. He goes to the surface with Frisk and the others, only to discover that human scientists have also begun researching “soulology.” The source of it all is the anomaly caused by that player. But Sans has no intention of taking on a whole skeleton-load of trouble. Still, one thing after another comes his way, and Sans catches sight of versions of himself fro
642Reads—Score118Shelves
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Undertale: She’s Not the Protagonist 传说之下：她不是主角
[Transmigration] [No Romance] [Ensemble Cast] [Everyone Is Strong] [A Little Golden Finger System, Redemption, and Wild Ideas] [Antagonist] [Slow-Paced and Lighthearted at First, Then a Transitional Middle] [Happy Ending] A lot of UT players transmigrated into this UT multiverse, a place that seemed peaceful on the surface but was actually rife with undercurrents... Narrator: *Among the people working to protect the peace of the universe, there is a hidden killer with the employee number 103. At
82Reads—Score—Shelves
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Undertale: Sans in the Apocalypse 传说之下：末世中的Sans
Told mainly from Sans's perspective. Zombie apocalypse. No overwhelming combat strength [probably]. A System is present. Not a mindless power fantasy, so readers will need to use their heads. Please check the warnings before reading. In the False Pacifist route, led by Frisk, the monsters emerge from the barrier and integrate into human society in almost the best way possible. “Monsters” become a special class of citizens in the country. But happiness is always fragile, and after this strange pl
237Reads8.7Score—Shelves
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Undertale Fanfic: A Few Things About a Certain Parallel Universe UT同人：某平行宇宙的那点事
[Everyone is humanized + tons of headcanons + multiple pairings and everyday life] (This is my first time writing a book, so please bear with me.) (Please don’t get too attached to the original characters, or they’re guaranteed to go out of character.) As you can see, the characters in this somewhat strange Undertale AU have all been turned into humans. There are no bone-filled brawls across the multiverse here, just a simple, peaceful daily life, with the occasional little trouble cropping
99Reads—Score—Shelves
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37
Undertale: Anomalous Timeline undertale：异常时间线
Long ago, two races lived on Earth: monsters and humans... Heh. You’ve heard this story many times before, haven’t you, “Player”? But this time, in the name of “Anomaly,” I unilaterally declare your game over. I’ll save this world from you, and that includes the poor child. I hope you like the little gift I’ve prepared for you. Brief version: In a special timeline, when Sans is replaced by an anomalous being and the truth of this world is revealed from the very beginning, where will the world ul
23Reads—Score—Shelves