Before he joined the Armed Detective Agency, Osamu Dazai was the youngest-ever executive with the Port Mafia, the most notorious underground crime syndicate in all of Yokohama. Three of its members-Dazai, Odasaku, and Ango-formed a camaraderie despite their vast disparities in rank. When Ango suddenly goes missing, Odasaku, a lowly Mafia grunt, receives direct orders from their boss to find him...only for Ango's trail to lead Odasaku to a mysterious, foreign criminal organization called Mimic.
 
(Source: Yen Press)
 
Note: The novel was later adapted into the Bungo Stray Dogs anime, consisting of episodes 13 to 16.

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 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.

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