Bungou stray dogs: Untold Origins of the Detective AgencyBungou Stray Dogs - Tantei-sha Setsuritsu Hiwa?; 文豪ストレイドッグス　探偵社設立秘話; Bungou Stray Dogs: Untold Origins of the Detective Agency; Bungo Stray Dogs: The Untold Origins; Великий из Бродячих Псов: Неизвестная история создания детективного агентства; Văn Hào Lưu Lạc: Bí sử thành lập Trụ Sở Thám Tử

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!