Y/N was the third introduction for the newly named 'Triple Black', among Dazai and Chuuya. For years, the outside world saw them as a powerful and dynamic team, even with the opposing characters of them all. The most feared executives in Mafia history. But behind closed doors? A polygamous throuple. The three of them hid their relationship, very well, but that didn't stop them from teasing each other... and facing the consequences once the crowd disappears~