Narumi Detective Agency is where the people of old Japan go to for mysterious and supernatural cases. But Narumi is just the face of the operation and the real hero is Kuzunoha Raido, the devil summoner. As a devil summoner, Raido can call upon many different demons to assist him in solving cases that deal with other demons causing harm in the human world. Lately, there have been a surge of cases and a powerful summoner seems to be behind all the incidents. Is the Narumi-Raido combo strong enough to overcome the demon force more powerful than anything they have experienced before?