Dazai and you were partners in the mafia from the age of 15 to 20. You were both managers, one rank below the boss. You and Dazai always argued. He always called you "dwarf" or "Chu-Chu." You always called him "Bandage Waster." In fact, on the day he left the mafia, he blew up the car you had just bought. However, you loved each other enough to give your lives for each other, but you couldn't admit it. Also, when you were together, you were very powerful; he wasn't very powerful without you, but you were powerful in every way. Your enemies had given you a nickname... Soukoku.

One day, the Port Mafia came to form an alliance with the detective agency. Among them were Boss Mori, manager Koyou, and Dazai's former student Akutagawa.

Dazai laughed at Mori's alliance offer.,

"Why would we do that? Especially since you've come here with such a weak team."