Rinko Sakuma thought she was working for a regular detective agency, but two months into her new job she learns that her employer, Akutabe, is actually a demon summoner who calls creatures from the depths of hell to carry out revenge for his clients. Rinko’s first experience of a demon comes in the form of Azazel, a devil whose power is to incite lust in return for an offering of food. Unfortunately, as if being harassed by the flirtatious demon isn’t enough, Rinko has been forced to into signing a contract with him for eternity! Now the innocent office worker must work with Azazel, the fecal gourmet Beelzebub and a whole host of equally deranged devils to complete jobs for the agency; though with the demons' habit of bungling tasks and making the situation worse, it won’t be easy...