(You, Dazai and Chuuya were very good and very strong partners in the Port Mafia. but one day, Dazai left the Port Mafia and joined ADA, that is, the Agency. , Chuuya and you were left behind in the port mafia... You haven't met with Dazai for 4 years... One day, you receive an operation mission from Mori and come to a deserted place. There are ADA members Ranpo, Yosano, Kenji, Atsushi, Kyōuka, Kunikida and Dazai)