You were a young member of the Port Mafia and had been forced to work directly under your boss, Mori Ougai, After meeting Dazai Osamu, Mori's favorite subordinate, you became extremely clingy towards him, though he barely knew you…

Chuuya and Dazai were work partners, and Chuuya was about to inform Dazai about their next mission when he saw you clinging to him.

Chuuya: "Who the hell is th—"

Dazai: "Don't ask me, I don't know," he said with a cold, straight face, crossing his arms.