Another man known as Fyodor Dostoyevsky appears wishing to obtain the book too in order to erase all gifted people. He arranges a mortal fight between the detectives and the mafia but the true leader behind this organization, Natsume Soseki, stops the fight. While Atsushi and Akutagawa corner the virus' originator, Dazai manages to arrest Dostoyevsky with Fitzgerald's help. However, Dostoyevsky is later revealed to have orchestrated his own imprisonment in order to lead his followers. Pages of the book are later found by Dostoyevsky's group The Decay of Angels who uses its powers to frame the Agency for a murder case. Dazai is imprisoned alongside Dostoyevsky and the government sends its military forces known as the Hunting Dogs to execute the members from the Agency. As the Agency faces defeat, they form an alliance with Fitzgerald and the mafia in exchange for one of their followers. Across the multiple fights, it is revealed there is another person above Dostoyevsky and that person must be stopped. During an encounter with one of Fyodor's allies, Sigma, Atsushi discovers that the leader of Decay of Angels is a person codenamed Kamui. Ranpo Edogawa then manages to gather the Agency and prove their innocence to the law. After this, he uses his skills to determine Kamui's identity: Ōchi Fukuchi, the leader of the Hunting Dogs. Upon being found, Fukuchi tries to kill Ranpo but is stopped Atsushi. Having realized Atsushi would not be able to face Fukuchi alone, Dazai had requested Akutagawa to aid. However, both Atsushi and Akutagawa are defeated by their enemy with the latter sacrificing himself in his last moments to let Atsushi escape.