Chapter 1

Yn is Kirishima's adopted sister but also Todoroki's childhood best friend that moved after Touya died. Amajiki meets yn and develops feelings for yn but yn doesn't feel the same for Amajiki and starts dating Todoroki's brother Natsuo.

I find Natsuo attractive and I think there might be other people too but there aren't any fanfics that are x reader so here it and everyone is aged up.