It was a normal day at UA well that was until deku found out he could save and reset time and told todoroki and bakugou and showed them right then something forced him to reset. Meanwhile in the underground after another failed genocide frisk and Chara were set free and made it up to sans since Chara mostly only likes pranking people and was never evil only when them and frisk we're together but something reset the timeline and brought frisk to the "void".