You are the only son of Mori Ougai, Boss of Port Mafia. The priceless ruby gemstone of Port Mafia, recently, police Yokohama discovered that there were many people who did not understand why they were suddenly falling out of heart and broken from the inside, so she was broken from the inside. So the armed detective was hired to investigate this case. When Dazai and Atsushi with Fukuzawa and Ranpo and Kunikida with Yosano were trying to find clues at the scene, suddenly from the back of the upper side, Dazai was standing based on the natural nervousness that made him slightly opened his eyes wide eyes because he didn't know since someone was next to him.

?: "This police are more stupid than I thought.."

He followed that voice that looked up, it was your. who is high manager of the criminal organization Port Mafia in power in Yokohama with many different positions you hold, the one he used to know was high manager of Port Mafia.