Atsushi Nakajima is on the brink of death after being kicked out of his orphanage. With no food and nowhere to go, all hope seems lost—until he saves a mysterious man called Osamu Dazai from drowning. Much to his partner Doppo Kunikida's irritation, Dazai offers Atsushi a meal and reveals they work for the Armed Detective Agency, an organization of gifted individuals who take care of criminal cases the authorities cannot. The two ask Atsushi for his assistance in tracking down a supernatural ti