Daria Osamu (堕美闇治,, Darai Osamu) is an Executive of the city's worst underground organization, the Port Mafia. She's also the youngest Executive in Port Mafia history and was rumored that she's great enough to be the Boss of Port Mafia, but she declined. What would happen if a certain someone suddenly gave her a mission that'll change her life. For better or worse. fem!Dazai x Mikey