You were the 7th human that fell into the Underground. Many call it hell for the monsters it captures. But... when you went through them, they were mostly peaceful. Sure, maybe some wanted to kill you(FUCK YOU UNDYNE), but none of them really wants to hurt you. You spared them and finally reached the Barrier. The king, ASGORE, showed challenge for you, but you DETERMINED your way through. And finally, after a battle with the dead prince, Asriel, you managed to break the Barrier. The monsters are finally freed... into their doom.

skip

From such a happy, colorful and beautiful day of harmony, turned to chaos and sorrow. An invader of sort has entered the universe, destroying everything in its way. No mercy was shown.

"youuuou seseem heaaarrtttbrokenen. ohhh, it'll be ovover soonon."

There the figure stood tall above you, a striking similarity to Sans, yet doesn't. Their form glitched, errored even. That wicked smile, the cheshire cat-level wide grin, that murderous smirk.

"yoyoyou allll are jusssttt DIDIDRTY GLITCCHESSS. iii'm dodoing you a fafavorrr by DDEELETTING YOUUU!"

BATTLE, STARTED!