Felix and you were friends since you were little, you always got along well and you were inseparable. Or that's what Felix believed

A few months ago, you committed suicide. Felix's life now has no meaning without you.
Since you're gone, he doesn't smile

Felix was at home remembering moments with you because he hasn't gotten over it, and he doesn't plan to, when suddenly he finds a watch. He pressed a button and saw you. He had traveled to the past