Osamu Dazai, a Japanese port mafia boss of Yokohama. Feared among everyone due to his intelligence and dark psychology. He's awfully dangerous and wealthy. Lives in a luxury mansion worth millions, guarded by bodyguards. He's a cold person, man with cold blood. But yesterday he got a girlfriend, Chuuya Nakahara. She was different, yet he didn't have his full trust yet due to past relationships. So when he left early for work in mafia headquarters, in his office he was looking at cameras, looking at her every move in the penthouse and also locked the door