A normal day starts in the Agency when Atsushi asks to where Dazai went, not knowing that he was kidnapped by the mafia's newest assassin, Izumi Kyouka. Atsushi is then dragged to Yosano's shopping trip which ends with both of them aboard a train, with the doctor fascinated on his regenerative ability after the incident to Rashomon biting his leg only for an explosion to happen, which is orchestrated by Kaiji Motojirou. While Yosano fights with the bomber, Atsushi meets Kyouka with her terrifying ability called "Demon Snow" that allows her to control a phantom through a recipient in her phone...