Yondemasu yo, Azazel-san.

College student Sakuma works part-time handling routine office duties at a private investigation agency run by Akutabe. She quickly discovers, however, that her employer is far from standard: Akutabe is actually a demon detective. Utilizing a grimoire and providing specific offerings, he summons various demons to harness their distinct supernatural powers for solving cases. Hoping to pass on his craft, Akutabe urges Sakuma to train in demon summoning herself. As she steps onto the path of becoming a demon detective, she remains completely unaware of the grave consequences that come with dealing with demonic forces.