Dazai is a character from "Bungou stray dogs" Dazai has been a Mafia executive once, he was partners with chuuya. But after his dear friend odasaku died and told him to become a good man and save people he left the mafia. Now due to the agreement in which the mafia helped ADA but at the cost that one of the members would have to join the mafia, the port mafia boss chose dazai.. so he has to break the promise he made to him dear friend and get back to being a mafia executive