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A girl who has never seen the world outside of the lab sees it for the first time only to fall down into the underground. What will she find down there?

(Complete)Hopeless and in despair, Sans never thought he could escape the resets and continues caused by FRISK that tormented his life. But, when he thinks the kid is possessed and stops FRISK once and for all he finds out ... that he never really knew anything after all. No more resets. No more saves. No more hiding. Life will never be the same for the Underground. Souls and Science can be an unforgiving bitch. Relationship: Because of the nature of the way this fanfiction works, there are several Frisks. He knows all of them, but Sans only falls for one, and she is definitely over the age of 18. This doesn't blossom until some time later though, as this is way more than a sweet romance. Buckle up for some tragic dramatic scifi-twisting to the fantasy world of Undertale!

When Frisk falls into the Underground, she is horrified to discover the world of monsters is every bit as evil and broken as she had been told her entire life. But when she meets Sans, she wonders if there is love inside some of the monsters after all...

Frisk is a fallen human girl into the Underground. She meets some very special monsters, but will she meet someone extra special?

What happens if Chara got woken up when Frisk fell? What if Chara joins Frisk on their journey? What happens when Frisk starts killing? What will happen to Chara?

I was tired of fighting the pain, so I gave up. And then, a sudden yellow light burst trough the basement. Sans..? <> Frisk falls into the underground after running away from the orphanage she's been trapped in for a lot of years. In those years, a lot happened too. Like, when she was eleven, she went missing. Yet, she can't remember what happened. In the undergrounds, she meets the Mysterious Sans, who somethimes is called 'G.' Frisk finds out about what happened in the undergrounds, and what happened to Sans. (I WILL CONTINUE THIS FOREVER I WILL MAKE MY READERS HAPPY IM SO SORRY FOR DELETING THE DECENT SHIT BUT THIS IS WHAT WILL CONTINUE! PINKY PROMISE!)

Frisk spared everyone. The barrier was broken. All the monsters are free. But you, an 12 year old girl on a hiking trip, fall down. Now that the barrier is broken, no one should be left in the Underground, right? This is my first story, so it might not be too good... still, I hope you like it! Cover made by @Fluffy-Bush

In the undertale universe a human fell down into the underground (AKA the monsters' home) this human is known as Frisk. She (Canonically she is gender neutral but for the sake of the fanfic they will be known as a she) befriended the entire underground by freeing them from a seemingly eternal spell that trapped them down there for many years. Though to get there Frisk had to sacrifice a friend (Asriel) and from that day on frisk just couldn't get the fact that she couldn't save someone out of her head. And she will soon find out that she'll have to sacrifice a lot more.

A human falls into the Underground while playing the game Undertale. Along the way, almost everything seems normal. But, after the fight with Doggo, before you know it, they are teleported to a white abyss, and that's where things REALLY take off.

Chara has one objective: RESET back to when they themself fell, and save Asriel from his demise. With all the Genocide Runs the now-free Frisk goes on for them, they're able to amass a big enough collection of SOULs to do exactly that. The only problem is, Asriel remembers everything that happened when he was Flowey. And he isn't too happy about it... In this new timeline, Kelsa, the SOUL of Bravery, falls into the Underground shortly after Frisk. Determined to save her only friend, Kel teams up with a mysterious flower with a face to find them and rescue them from Asriel's notorious freezing chambers. Betrayed by many, and uncertain who to trust, Kel finds herself in the midst of an iron-fist dictatorship, fighting to restore the Underground to the peaceful place it used to be. But... all is not as it seems, and there may be things about Frisk that Kel will wish she'd never discovered... Cover art by yours truly :3 This story takes place after the events of Underhappened. You may wish to read that first if you haven't already :D

Imagine Undertale, but Chara never showed up. Chara wasn't the first human in the Underground. What if a glitch occurred, and you fell down instead? You fell into the Underground, but you cant remember your previous life. Now, you are surrounded by strange monsters, who have also never seen a human before. Will they let you live? [written 2017]

This is a story about the first human who fell into the underground... Her name was Chara, now we all know Chara as the human you play as in the genocide run... But she still hasn't told us her story yet. So I'll just have to tell it to you in this book. Chara's life wasn't so awesome when she lived in the Human world and it slowly got better when she fell into the underground, but then she made it worse...

Frisk has fallen into the tough world of Underfell. She's fallen from her home above, where people knew sign language and understood her. How this happened, even she doesn't understand. Will she be able to make it through the underground being mute, or will she be the truly fallen child? Image by artisticanimal101, and edited by me. Credit to original creators of Underfell. Credit to Toby Fox, the creator of Undertale. The storyline is created by me, please do not steal.

This is a female reader x fell sans. (Y/N) was a kind girl. She loved her family and her friends. One day something went wrong and she fell into the Underground from the top of Mt.Ebott. After a weird run in with a talking flower, a killer goat lady and other weird deadly monsters, she finds herself in one of her worst situations yet. But is this new monster really a foe?

Undertale: After the Neutral Kai, the ninth human to fall into the Underground after Frisk, finds himself in a strange world filled with monsters and mysteries he doesn't understand. With no knowledge of the world he's in or the events that led up to his fall, Kai's journey begins in the Neutral route, where he encounters both allies and enemies alike. From the quirky and mysterious skeleton, Sans, to the imposing Empress Undyne, every encounter brings Kai closer to discovering the truth about the Underground and his place within it. Along the way, Kai must face the consequences of the choices made by those before him, and the inevitable judgment that awaits. Will Kai forge a path of peace, or will his fate be sealed by the ruthless actions of others?

This adventure takes place after a neutral run where Frisk doesn't Reset. The new human that falls, (Y/n), is a very optimistic character that will once again bring happiness to the underground. You will also get close to Sans and learn about him and his fallen brother. NO LEMON! COMPLETED P.s (I do not own any of the art shown in this story or Undertale itself. All rights go to Toby Fox). If you enjoy this story, please be sure to read my 2nd story "My Undertale Quest".

This story is inspired by many other works and may bear some resemblance in certain places. However, I will endeavor to make this story it's own. 2 years ago monsters were released from the underground, ending their centuries-long imprisonment at the hands of ancient humans. Not a soul remains in the underground. But that doesn't mean no one's there. Be it chance or fate, The First Fallen will soon meet an all too curious human as he ventures into the deep beneath. The Reader or [Y/n] is male and Chara is female. I apologize if this bothers you it's just how I've always seen the character. Disclaimer: I don't own these Chara-cters nor do I own Undertale. This is just for fun. This story's rating is [M] for explicit language, violence, suggestive or sexual themes, and fantasy/fictional violence. My lovely reader @NightTheDemon1 told me that the artist of the cover is a Twitter user known as @A___IRAA. Thank you!

It's about Frisk ( yes she will be girl in mah story :p ) falling in the underground and.. Guess what? She will meet a special someone... a great friend!! and it won't be flowey ! This book will focus more than Frisk and Chara.. each monster's POV.. a story.. a tale for their own. Welcome to TheirTale. Hope you enjoy my story

One month before Frisk falls into the Underground a different human falls, someone that is not from this world, but from ours, and now they have the power to change the world as they please. What will they do, will they do the genocide route and become a megalomaniac? Nope, they want to be everyone's friend and get their version of a perfect ending.

A human with extremely rare soul has fallen into the underground with the soul colour of every single colour meaning leadership