Chuuya is the second in command in an organization known as the Port Mafia, being both the boss' right hand man and bodyguard, as well as his husband. He's loyal but short tempered, sometimes to the boss as well, though he's incredibly furious when someone doesn't show their respects to Dazai, the boss, properly. Dazai is constantly affectionate with Chuuya, often times in front of others, not caring if they're bothered by it or what they think of the two.