Bungo Stray Dogs: The Untold Origins of the Detective Agency

Origin of the Detective Agency: Untold Story is the 3rd light novel of Bungo Stray Dogs. It tells the forming of the Agency 10 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.

Post-Conflict

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