* Ahuhuhu~
* This page needs tidying up, my deary~
* After all, unfortunate things happen to messy places.

To meet the UTAU wiki's quality standards, this article may require cleanup. Please help by improving the article.
SideHeart is an AU of Undertale where a human fall before Chara, all of the humans are still alive to this day, and a civil war take place between the factions of Undyne and Toriel.

It's still in developpment.


A long time ago, years after monsters were trapped undergound, a human fell. He was hurted but alive and calls for help. Asriel, son of the king, came to his rescue. His name was Josh.

He was adopted by the Dreemurr family, and all the underground lived peacefully.

Until the day were another human fell, and Asriel helped them too. Their name was Chara. They became closer, way closer than Asriel and Josh, which bring some hate and jealousy inside Josh.

Everything was alright, until Josh had enough and challenged the other human. It's with a legendary calm than the human accepted, their fight will take place the next day.

Despite the efforts of Asriel too stoped it, the fight took place. Having worked under the tutelage of gaster and having gaining much magics powers, Josh should have had the advantage but strangely, the more the fight progressed, the more Josh had doubts his opponent was really human.

He emitted a strange energy, Josh didn't know what it was, but he prefered fight forr his honor. His rival not having moved yet, took out a sharp knife and run into him.One hit and Josh was down with just a few HP. Chara get closer, looking like to finish him, but instead they helped him to get up and said :

"Humans are weak..."

And he returned to Asriel.

Everything was alright again, until the tragic day were Chara and Asriel died. The Dreemurr and the entire kingdom cried, but Josh didn't cried. He smiled. It was a smile of hate.

After those funerals, the king and queen have too take a important decision. Should the humans be killed knowing one of them live among monsterkind ? A long debate started between them and quickly escalated into a verbal fight. Josh stopped it, he became cold and distant when his sibling died, but when the debate took serious measures, he calmed it and the decision was took. Fallen humans will still be protected by monsters.

Several others humans fell, but some monsters, as Undyne, really disliked the policy of the king which favorised the ones who made their ancestors suffer so much. She decided to start a rebellion with the fellow dislikers monsters against the Dreemur.

War was stated.The two factions, loyalist and deviant, fought against each others without mercy. Many monsters died for their leaders. During the battle, Undyne killed Asgore. The rebels were still beaten with the helped of Sans,Gaster and Josh.The three of them created a magic barrier between Waterfall and the rest of the kingdom, Waterfall where the rest of the deviant monsters were banished and where they built another city, in the waiting of their revenge.Their ultime goal is to destroy the barrier.

During this period, many were the traitors, spies and assassins. The Underground should be saved from this situation, but by who ?

Of the eights fell to this day, one was dead, another was cold and solitary, and the others were scattered into the kingdom, under the protection of Queen Toriel and her Royal Guard.

And one day, another human fell. It must have been years since the last did, and the Underground was still in a war situation. Undyne have found many allies, like the former members of the Royal Guard, now named the Freedom Guard, and the former Royal Scientist, Alphys. The inhabitants of Waterfall were evacuated or submitted.

The fallen child, with the help of Patience, course their way in the Ruins, followed by the spirit of an ancient human.

Characters (by order of appareance)

  • Flowey, a strange flower which looks like they side for Undyne.
  • Patience, named Celeste. Adult Human charged by Toriel to take care of the humans fallen into the ruins as they are safe of Undyne servants.
  • Napstablook, the shy ghost.
  • Bravery, named Brayan, a really brave soul and best friend of Papyrus.
  • Papyrus, a skeleton who trains the human child with puzzles for being strong and not being killed by Undyne.
  • Integrity, named Aurelia, a really generous soul and guardian of the frontier.
  • Alphys, the former royal scientist, who switched in the dark side despite her weakness.
  • Undyne, leader of the rebellion, but inside she just wants to bring her friends were they will be happy.
  • Sans, now the royal scientist, still loves making puns.
  • Perseverance, named Pam, a nerdy lover of scy-fy, helper of Sans.
  • Muffet, the spider who hasn't choose her side yet.
  • Kindness, named Rory, a culinary spy of the queen, who suspects Mettaton.
  • Mettaton, a hiding traitor who reveals himself in his latest TV show.
  • Justice, named Jade, the soul who tolds the history without fear, being in genocide or pacifist doesn't matter to her.
  • Josh, the judge who doesn't do his job with limits.
  • Toriel, the queen who makes her best to make her subjects happy.
  • Omega Flowey, the traitor of both sides.
  • Asriel, God of hyperdeath, the re-born son.
  • Chara,a corrupted human of our genocide.


  • Asgore, the caring king.
  • Gaster, the master of magic.


This was translated from French, so they are possibly grammar errors.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.