...I'm Undertale trash. This is basically going to be the story of Undertale retold as the Underfell version. I'm sure something like this exists already...but whatever. The story is told from Frisk's point of view, and it's the Pacifist version because Genocide scares me. Anyways I hope you like it!
You died. Again. But, when you woke up... You were back at the beginning. You didn't reset... but something was off. Flowey seemed skittish, frightened even. He was KIND. The people you knew, you once held dear... CHANGED. The entire underground was different... Dark. Nobody seemed to recognize you, but a part of them...
After Frisk goes missing, Caitlin, Frisk's twin sister goes looking for her in the the last place she saw her. MT Ebott, the mountain of dark legends, she finds a necklace that belonged to Frisk on the ground. Just like Frisk, Caitlin tripped and fell into the Underground. Caitlin finds things she never knew existed.