Our hero, Atsushi Nakajima, was kicked out of the orphanage. Standing at the river, he thought of starvation,but instead saved suicide. This annoyed her rescue people, Dazai Osamu, it turned out, is "armed detective agency ", all employees who have supernatural abilities. They are taking up the most dangerous things that can not even manage the army and police. And at the moment Dazai with a partner,Kunikidoy Dopp busy investigating attacks man-eating tiger, appeared in the city at about the same time, when here came Atsushi. Realizing that Atsushi has something to do with what is happening, Dazai hires him to help with the case.