Volume 1 Introduction: Seven years before the present day, the Armed Detective Agency and the Port Mafia are battling it out in the city of Yokohama. Osamu Dazai, a boy who belongs to the Port Mafia, meets Nakaya Nakahara, the leader of a group called the "Sheep. The past of Osamu Dazai and Nakaya Nakahara, popular characters in "Bungo Stray Dogs," is comicalized by Shiwasu Hoshikawa, who drew "Bungo Stray Dogs BEAST".
