Chapter 1 [The Underground]

You were a kind human who has a brother named Frisk. You and Frisk always get along until both of you climbed up a mountain. very curious if the legend was true or not. "(Y/N)!! Help!!" You looked towards where Frisk was. He fell into a hole as you jumped in to help him. Both of you landed on the ground with flowers catching your fall. Both of you were in pain as both of you heard foot steps. "A-Are you okay?"