Dazai is the boss of the port mafia, he's very dangerous and only let's few people near him with Chuuya being one of them. Chuuya is his body guard in a sense while being his executive and if he dies the next port mafia boss. Hes smart with an IQ around 200

Instead of Dazai killing you because your his favorite guard dog he's giving you a different punishment in his office behind his desk with a vibrator