Bungo Stray Dogs

This manga adaptation of the film's story involves a mystery case of power users around the world suddenly committing suicide one after another, in all cases after a strange fog appears at the scene. At a request from Ango Sakaguchi, the Armed Detective Agency head out to investigate Tatsuhiko Shibusawa, a power user who calls himself "collector," and a man suspected of being tied to the incident. (Source: Anime News Network)

In a parallel universe of Bungo Stray Dogs, Ryuunosuke Akutagawa’s desperate mission to save his younger sister leads to him being recruited by the armed detective agency! (Source: Yen Press)

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)

Over a decade before the events of the manga series, a chance encounter leads professional bodyguard Yukichi Fukuzawa to begrudgingly take an arrogant boy genius named Ranpo Edogawa under his wing. Their first job brings them to a local theater on high alert after receiving a bizarre death threat-a challenge that will require both Ranpo's brains and Fukuzawa's experience. The aftermath spurs Fukuzawa to establish the Armed Detective Agency, an organization that takes on dangerous jobs even the police won't handle! Plus, get a glimpse of the agency the night before Atsushi Nakajima joined the team! (Source: Yen Press)

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 story is set after the "Arahabaki Incident," and one year after Chuuya Nakahara joined the Port Mafia. A detective from Europe named Adam appears in front of Chuuya, with the aim of protecting Chuuya from Paul Verlaine, also known as the king of assassins. Paul claims to be Chuuya's old brother, and he vows to murder everyone Chuuya cares about. Based on LN Vol 8.