Bundled with the 13th volume of the Bungou Stray Dogs manga, adapting Chapter 40 of the manga.
 
Note: While this was released related to the second season, the chapter it adapts both chronologically takes place during the third season as well as the chapter count its from is during the third season.

Having been kicked out of the orphanage, a despairing young man by the name of Atsushi Nakajima rescues a strange man from a suicide attempt--Osamu Dazai. Turns out that Dazai is part of an armed-detective agency staffed by individuals whose supernatural powers take on a literary bent! 

(Source: Yen Press)

The third season of Bungou Stray Dogs. 
 
The White Tiger and the Black Beast – Nakajima Atsushi and Akutagawa Ryunosuke’s fight against Francis F. brings an end to the great war against the Guild. Life goes on as normal in Yokohama, thanks to the continued truce between the Armed Detective Agency and the Port Mafia, who, together, saved the city from ruin. But there are still rumors of Guild stragglers and other crime organizations making their way in from abroad. Meanwhile, Dazai Osamu had premonitions of another impending disaster. Lurking in the darkness is the Fyodor D., leader of pirate organization Rats in the House of the Dead, his dreadful plans on the verge of execution.
 
(Source: Crunchyroll)

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