A former Guild assassin starts attacking people. He inflicts both Fukuzawa and Mori with a curse that drains their lifespan. Dazai realizes that Fyodor is controlling this person and learns that Fyodor is searching for a book that will allow him to rewrite humanity at his will. Before leaving, Dostoevsky has a man shoot Dazai in order to pass his information to the Agency. As a result, the Agency and Port Mafia are forced to fight one another as the winner will find a cure to heal their superiors. Kunikida replaces the unconscious President and is assisted by Edogawa to provide with strategies to confront the Port Mafia who attack their building.