Bungo Stray Dogs, Vol. 3 (light novel): The Untold Origins of the Detective Agency (Bungo Stray Dogs (light novel), 3)

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!