Cannibalism Arc

Cannibalism Arc is the third arc of Bungo Stray Dogs. It introduces a new group of antagonists, the Rats in the House of the Dead.

Summary
A new criminal organisation called the Rats in the House of the Dead makes its existence known to the Agency. Little is known about it and its alleged leader, Fyodor Dostoevsky, but a downward spiral begins when Yukichi Fukuzawa is attacked and left gravely ill. Both him and the Port Mafia's leader, Ōgai Mori, have been infected with a virus named Cannibalism. After forty-eight hours, the virus will destroy the hosts' internal organs, unless one of them dies before the virus outbreak, thus nullifying the other's illness. The Agency and the Port Mafia start a bloody feud to save their respective leaders before it is too late. 

Impact

 * Fukuzawa and Mori's shared past is explained. The two met ten years ago, when Fukuzawa still worked as a bodyguard and Mori as an underground doctor.
 * Natsume Sōseki appears for the first time in his human form. Until now, he has been only seen in his cat form as Kirako Haruno's cat, Mii-chan.
 * Four members of the Rats in the House of the Dead have been identified so far at the end of the Cannibalism arc : the leader Fyodor Dostoevsky, the virus ability user Alexander Pushkin, the former Guild member Nathaniel Hawthorne, and Ivan Goncharov.
 * Fyodor is arrested and locked up at the end of the arc.
 * It is made clear that Dazai's ability nullifies Yosano's; Dazai thus must undergo the traditional healing process.