I Hate Humans (Male Chara X Human Female Reader)

This is the story on how you met the most evil creature in the world, satan if you will, his name is Chara.
Chara has once before ended the whole world but somehow one day it restarted without his concent, he thinks it's because of you. You, a human teenage girl who never existed before now magically appeared and is Frisks older sister.
Who are you, and where did you come from? And why did the world restart and have you in it?

All CHARActers belong to Toby Fox other then the character which I kinda created, Reader.
I take no credit for any characters other then reader and any other characters I may add which I will put here if I do create anyone else