you can choose between chuuya and dazai to control a A.u and swap i.e. ADA chuuya and BOSS OF THE PORTO MAFIA dazai

It was a masquerade ball of the port mafia, Chuuya had already been part of the mafia, we can say that he was dazai's "toy", but after that he betrayed the port mafia and went to the ADA and dazai after that killed the former mafia boss and took his place, two members of ADA are there, Chuuya and Yosano, until someone says that the mafia boss wants to talk to Chuuya