Bungou Stray Dogs: Dazai, Chuuya, Juugosai

Bungou Stray Dogs: Dazai, Chuuya, Juugosai is a light novel volume written by Kafka Asagiri and illustrated by Sango Harukawa. It serves as a narrative prequel to the main Bungou Stray Dogs series, focusing on the tumultuous formative years of Osamu Dazai and Chuuya Nakahara when they were members of the Port Mafia at the age of fifteen. The work was published to expand upon the lore of the franchise, specifically detailing the duo's first meeting and the origin of their infamous partnership, often referred to by fans as Soukoku.

The creative direction of this volume reflects the series' signature blend of literary homage and dark urban fantasy. Sango Harukawa's character designs in this installment emphasize the contrast between the two protagonists, capturing Dazai's detached, strategic demeanor alongside Chuuya's raw, kinetic energy. The novel was well-received within the Bungou Stray Dogs fandom for providing critical emotional context to the characters' later animosity and eventual cooperation, solidifying its place as a cornerstone of the series' supplementary storytelling.