: They investigate rumors of the previous Port Mafia boss returning from the dead, eventually uncovering a plot involving the investigator Arthur Rimbaud.
The third season of , produced by Studio Bones and directed by Takuya Igarashi, aired from April to June 2019. Spanning 12 episodes, this season masterfully balances the franchise's signature dark prequel lore with a high-stakes modern-day battle for Yokohama. The Prequel: "Dazai, Chūya, Fifteen Years Old" Bungou Stray Dogs 3rd Season
: This arc reveals how Chūya joined the Port Mafia and provides early glimpses into Dazai’s cold, manipulative brilliance. The Main Plot: The Cannibalism Arc : They investigate rumors of the previous Port
After returning to the present, the season introduces its primary antagonist: , leader of the "Rats in the House of the Dead". The Prequel: "Dazai, Chūya, Fifteen Years Old" :
: The virus will kill both leaders in 48 hours unless one of them dies first, which would save the other. This forces the Agency and the Mafia into a bloody all-out war to protect their respective heads.
Season 3 opens with a three-episode adaptation of the light novel prequel. Set seven years before the main story, it explores the chaotic "Dragon’s Head Conflict" and the first meeting between and Chūya Nakahara .
: Ultimately, Atsushi Nakajima and Ryūnosuke Akutagawa are forced to combine their powers to defeat Fyodor's subordinate, Ivan Goncharov, while Dazai outmaneuvers Fyodor on the intellectual battlefield. Production and Technical Highlights