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)

The second season of Bungou Stray Dogs. 
 
Despite their differences in position, three men—the youngest senior executive of the Port Mafia, Osamu Dazai, the lowest ranking member, Sakunosuke Oda, and the intelligence agent, Angou Sakaguchi—gather at the Lupin Bar at the end of the day to relax and take delight in the company of friends. 

However, one night, Angou disappears. A photograph taken at the bar is all that is left of the three together. 

Fast forward to the present, and Dazai is now a member of the Armed Detective Agency. The Guild, an American gifted organization, has entered the fray and is intent on taking the Agency's work permit. They must now divide their attention between the two groups, the Guild and the Port Mafia, who oppose their very existence.

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)

Not long after Ougai Mori takes the reins of the Port Mafia, he orders a young Osamu Dazai to investigate an ominous rumor of something called “Arahabaki.” Whoever or whatever it is seems to have some connection to Mori's deceased predecessor—and the new boss would very much like for the dead to stay buried. Along the way, Dazai runs into a gravity manipulator named Chuuya Nakahara, leader of the Sheep gang of youths. Together, the two will one day achieve infamy as the fearsome duo known as Twin Dark, but for now, they'll have to learn to put aside their differences if they want to get to the bottom of this mystery…
 
(Source: Yen Press)
 
Note: The novel was later adapted into the Bungo Stray Dogs anime, consisting of episodes 26 to 28.

The fourth season of Bungou Stray Dogs. 
 
No longer concerned with military affairs, Yukichi Fukuzawa intends to act as a lone bodyguard-for-hire, making use of his deadly swordsmanship. However, things are not going as planned for his freelance business, and that is when he crosses paths with a mouthy boy named Ranpo Edogawa. While their initial interactions are intertwined with a bizarre murder mystery, the aftermath prompts the formation of the Armed Detective Agency. 
 
Presently, Ranpo finds himself chasing down a gifted individual with the dangerous ability to execute the perfect crime. But as the great detective unravels the case, he soon discovers an elaborate plot to obliterate the Agency in its entirety. 
 
Although forewarned of the trap, the Agency continue their pursuit of the criminals, only to end up framed for the crime themselves. Now branded as wanted terrorists, the remaining members must find a way to prove their innocence—even if they must turn to sworn enemies for assistance. 
 
(Source: MAL Rewrite)

Not long after Ougai Mori takes the reins of the Port Mafia, his accomplice Osamu Dazai has a dreadful run in with Chuuya Nakahara, a boy known as the Sheep King who is capable of manipulating gravity. But when strange rumors about the mysterious being Arahabaki start spreading throughout Yokohoma, the duo must put aside their differences and get to the bottom of things. Before they achieved infamy as the fearsome pairing Twin Dark, Dazai and Chuuya were just boys. Was their first encounter a harbinger of hope, or an ill omen of things to come...?
 
(Source: Yen Press)

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.

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