Girl may kill manga

Girl May Kill summary:

A port town where the Mafia actively operates behind the scenes. Gohongi is a young man who has come back to this to place where he was born after many years and finds a job working at a video rental store, which also becomes his new home. It is here that he begins to live with a young girl named Mei and a homosexual by the name of Katsura. But both of them are members of the Mafia group, Lovely Town. And fifteen-year-old-Mei is a ruthless hitman. There have been rumors that the struggles between Mafia factions are becoming more intense. Still not able to completely grasp the situation, Gohongi winds up getting dragged into a world of trouble...