Bungo Stray Dogs Novel was written by Kafka Asagiri and features illustrations by Sango Harukawa.

Doppo Kunikida is an idealist and a strait-laced detective at the Armed Detective Agency, an organization that takes on dangerous jobs that even the police won't handle. Everything in his life is progressing as planned until one day he's ordered to watch over the new guy, Osamu Dazai, a suspicious fellow of unknown origin who is obsessed with the thought of suicide. While investigating an unusual case involving a so-called haunted building, they find several of the missing people from another investigation. However, before they can find out how these cases connect, they are attacked by the mafia's Ryunosuke Akutagawa, sworn enemy of the agency! This is the beginning of a hopelessly inseparable relationship between two detectives. A battle of Abilities erupts in the shadows of Yokohama!

Bungo Stray Dogs Novel volume 2 was written by Kafka Asagiri and features illustrations by Sango Harukawa.

Before joining the Armed Detective Agency, Osamu Dazai was the youngest executive with the Port Mafia, the most notorious underground crime syndicate in all of Yokohama. When one of their colleagues suddenly goes missing, Dazai and fellow Port Mafia member Sakunosuke Oda are tasked with conducting an investigation...and at last, the reason why Dazai parted ways with the Port Mafia is revealed!

Bungo Stray Dogs Novel volume 3 was written by Kafka Asagiri and features illustrations by Sango Harukawa.

Ten years before the events of the manga series, a fateful encounter brings a professional bodyguard named Yukichi Fukuzawa and an arrogant boy genius named Ranpo Edogawa together. The result: the establishment of the Armed Detective Agency, an organization that takes on dangerous jobs even the police won't handle!

Bungo Stray Dogs Novel volume 4 was written by Kafka Asagiri and features illustrations by Sango Harukawa.

The Armed Detective Agency's latest case brings them to a strange island off the coast of Yokohama called "Standard Island," but what awaits them turns out to be far more complicated than expected: a bomb, time travel, a mysterious skill user named H.G. Wells... Will this incident spell the end of Yokohama itself?!