Bungo Stray Dogs: The Untold Origins of the Detective Agency

Bungo Stray Dogs: The Untold Origins of the Detective Agency (文豪ストレイドッグス 探偵社設立秘話, Bungō Sutorei Doggusu Tanteisha Setsuritsu Hiwa) is the 3rd light novel of the series. It tells the forming of the Agency 12 years before the main timeline, as well as the meeting of Yukichi Fukuzawa and Ranpo Edogawa.

The novel also tells a little bit of Sakunosuke Oda's past as an assassin.

Description
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!

Table of Contents

 * A Day at the Detective Agency
 * The Untold Origins of the Detective Agency
 * Afterword

Post-Conflict

 * Sakunosuke Oda later quit his assassin job after meeting Natsume Souseki.
 * Sometime after the agency's establishment, Kunikida and Yosano joins in.