Story Arcs

The ghost of the previous boss haunts the Port Mafia. At fifteen, Osamu Dazai, under the careful eye of Ōgai Mori, receives his first mission to investigate the matter. The investigation leads him to Chūya Nakahara, the infamous "King of the Sheep", a rival group of juveniles. With his own past unknown to him, and the lives of Sheep members on the line thanks to the Port Mafia, Chūya agrees to work alongside Dazai in order to unveil the truth behind the Port Mafia's former boss.

Before joining the Armed Detective Agency, Osamu Dazai was the youngest executive with the Port Mafia, the most notorious underground crime syndicate in all of Yokohama. When one of their colleagues suddenly goes missing, Dazai and fellow Port Mafia member, Sakunosuke Oda are tasked with conducting an investigation.

Doppo Kunikida is an idealist and a straitlaced detective at the Armed Detective Agency, he's paired up with the agency's newest hire: a suspicious, eccentric, suicide-obsessed man named Osamu Dazai. Their first case together turns out to be far more complicated than Kunikida anticipated -- and it looks like the detective agency's sworn enemy, the Port Mafia, is somehow involved, too!

The Armed Detective Agency vs Port Mafia Arc is the first arc of Bungō Stray Dogs. Serving as the introductory arc, it showcases the protagonist, Atsushi Nakajima, as he adapts to live with his ability and meets both the Armed Detective Agency and Port Mafia, becoming the epicenter of their latest conflict.

The Guild Arc is the second main narrative arc of Bungō Stray Dogs, and introduces The Guild, a foreign ability-based organisation as a new antagonist group. Led by Francis Scott Key Fitzgerald, the Guild attempts to take over Yokohama. With this new enemy rising, the old bones of contention are put aside and the distinction between foes and allies is blurred as the Agency has to ensure his survival.

The Armed Detective Agency is called upon to investigate the apparent suicide cases of hundreds of supernatural ability-users around the globe, which occurred when a mysterious fog passed over their countries

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In the third main narrative arc, a new criminal organization 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.

A terrorist known as the "Decay of Angels" lead the Armed Detective Agency into a trap that made them criminals. Meanwhile, Dazai was arrested by a hunting dog.