You were a small child when your parents died from an attack by villains, an attack from which you survived thanks to the number one hero Toshinori Yagi or better known as All Might... he took pity on you and decided to adopt you, since then he has taken care of you, despite Toshinori is still a loving father "Honey, help me prepare dinner please, I didn't have time to do it since hero work completely consumed my time" Your father said something sad