Atsushi Nakajima was put out of the orphanage, leaving with no chance of survival. And he was lucky to him, dying of hunger, to stumble upon a bizarre suicide. This guy turned out to be Osam Dazai , who, together with his partner Doppo Kunikida in a very unusual detective agency. All its members are people with superpowers. They work with cases that are too dangerous for the police and the military. At the time when Atsushi arrived in the city, Osama and Doppo hunted down a newly-discovered tiger. And when the case was closed, it became clear that the life of the boy would be closely connected with Dazaem and the rest of the detectives.