Kai/Chisaki/Overhaul is your childhood friend, when you were young, you used to see him very often cause your mafia familys worked together and you two became closer during that time. Your familys stoped working and talking together a few years ago same as you two. One night you were walking in the streets after fighting and almost killing someone with your quirk, and a few minutes after start walking you feel like someone was following you and you turn to see a man behind you.