Bungou Stray Dogs — Story Arcs & Filler Guide
Episode ranges, plot summaries, and frequently asked questions for every major arc in Bungou Stray Dogs. Updated 2026.
Filter by arc
Atsushi Joins the Armed Detective Agency
Eps 1–12 · 12 epsWho is Atsushi Nakajima?
A former orphanage resident who discovers he possesses the ability to transform into a white tiger, recruited into the Armed Detective Agency after a chance encounter with Osamu Dazai.
What is the Armed Detective Agency in Bungou Stray Dogs?
A private detective agency in Yokohama made up of supernatural "ability" users, taking on cases the police can't handle — and frequently clashing with the criminal Port Mafia.
Dazai's Port Mafia Past
Eps 13–24 · 12 epsWhat is Dazai's history with the Port Mafia?
Osamu Dazai was once a rising executive within the criminal Port Mafia before leaving to join the Armed Detective Agency. This arc explores his past through dual-timeline flashbacks, including his complicated relationship with fellow former Mafia member Chuya Nakahara.
The Guild Arc
Eps 25–36 · 12 epsWho is Francis Fitzgerald in Bungou Stray Dogs?
Francis Fitzgerald leads the Guild, a wealthy American ability-user organization that invades Yokohama seeking to seize the city's resources, forcing the Agency and Port Mafia into an uneasy alliance.
Decay of the Angels
Eps 37–61 · 25 epsWho is Fyodor Dostoevsky in Bungou Stray Dogs?
Fyodor is a manipulative mastermind who orchestrates events from the shadows across multiple arcs, eventually revealed as one of the series' most dangerous long-term antagonists.