The Haikyuu Mafia

After a lifetime of being down on luck, Y/N finally found a place to belong. this was to be short-lived when a mistake leads to a path-altering encounter. this encounter would land her in possession of a peculiar little pin. a pin that would allow her access to anything within the city, any door and any safe. What mobster wouldn't kill for something as unbelievable as that!??
Suddenly, Y/N would find herself the target of some of the deadliest gangs in Japan. What is Y/N to do? Steal the heart of an unsuspecting mafia boss who would stop at nothing to defend Y/N!!