Scattered and alone, the members of the Armed Detective Agency disappear one by one as Kamui, the leader of the Decay of the Angel, seeks to eliminate them once and for all! But Atsushi and the others aren't out of the fight just yet. As they piece together allies and information in preparation for a counterattack, the return of a familiar face brings hope that they may be able to turn their desperate situation around! However long the night, the dawn will break-the agency's revival is at hand!