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Doppo Kunikida is an idealist and a straitlaced detective at the Armed Detective Agency, an organization that takes on dangerous jobs even the police won't handle. Everything in his life is going just as he's planned... until one day, he's paired up with the agency's newest hire: a suspicious, eccentric, suicide-obsessed man named Osamu Dazai. Their first case together turns out to be far more complicated than Kunikida anticipated?and it looks like the detective agency's sworn enemy, the Port Mafia, is somehow involved, too!

Set two years before the events of the manga series, this is the tale of how two seemingly incompatible personalities end up forming the partnership that has made them one of Yokohama's top detective duos!

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. At last, the reason why Dazai parted ways with the Port Mafia is revealed!

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!

The Armed Detective Agency's latest case brings them to the floating city Standard Island, a strange man-made vessel and a resort for the wealthy off the coast of Yokohama. But what awaits the detectives turns out to be far more complicated than any of them could have expected: a bomb, time travel, a mysterious skill user named H. G. Wells... Will this case spell the end of Yokohama itself?!

An unexplained spate of suicides by skill users worldwide has sent the Armed Detective Agency on a search for Tatsuhiko Shibusawa, a mysterious skill user who may be connected. Each incident occurs under the blanket of a thick fog... just like the one descending on Yokohama. Kyouka Izumi and Atsushi Nakajima are hot on Shibusawa's heels when they run into their enemy Ryuunosuke Akutagawa--but this time, the three share the same goal: Find Shibusawa and save Yokohama from certain destruction!

Discover what lies beyond the eerie mist in this novelization of the hit anime film Bungo Stray Dogs: Dead Apple!

What if the Port Mafia's Hellhound, Ryuunosuke Akutagawa, had joined the Armed Detective Agency? Likewise, what if Atsushi Nakajima belonged to the Port Mafia? In the parallel world of Bungo Stray Dogs: Beast, fledgling detective Akutagawa's desperate mission to rescue his younger sister from the Port Mafia's clutches brings him face-to-face with the organization's fearsome White Reaper... a.k.a. Atsushi Nakajima. What does fate have in store for the two beasts in this alternate tale of darkness versus light...?

Not long after Ougai Mori takes the reins of the Port Mafia, his right-hand man, Osamu Dazai, has a nasty run-in with a gravity manipulator named Chuuya Nakahara, leader of the Sheep gang. However, with ominous rumors about Mori's deceased predecessor as well as the mysterious being called Arahabaki spreading throughout Yokohama, the duo must put aside their differences and get to the bottom of things. Before they achieved infamy as the fearsome pair Twin Dark, Dazai and Chuuya were just boys. Was their first encounter a harbinger of hope or an ill omen of things to come...?

It's been roughly one year since Chuuya Nakahara joined the Port Mafia, and he's determined to become an executive before fellow mafioso Osamu Dazai. However, a man by the name of Paul Verlaine--the king of assassins who claims to be Chuuya's older brother--suddenly appears, vowing to murder everyone he cares about! Now Chuuya must team up with Adam, an AI investigator from Europe, to stop this madman before another storm engulfs Yokohama. Along the way, many truths will be revealed... including the answer to Chuuya's most pressing question: Is he himself even human?

Young, hungry, and homeless, the orphan Atsushi Nakajima sees his hard-knock life turn around when he meets Osamu Dazai, a peculiar man who's part of a group of detectives with special powers. And he wants Atsushi's help to catch a man-eating tiger that's terrorizing Yokohama?!

Experience the beginning of the hit anime series adapted into a novel!

Yukito Ayatsuji, a brilliant investigator known as the Homicide Detective, has a skill so deadly that he is assigned a minder--rookie Special Division for Unusual Powers agent Mizuki Tsujimura--to monitor him. And when Ayatsuji is tasked with solving a murder case, who should be pulling the strings behind the scenes but his archnemesi... Natsuhiko Kyougoku?! As the stakes continue to ramp up, so too do the mysteries. In this battle of wits between a sorcerer and a detective, it's trick or be tricked!