The so-called "exorcism" is the work of sending the monsters that have come to the "real world" from the "hidden world" for some reason back to the "hidden world". One day, a high school student, Ashiya Hanae, who was possessed by a monster, came to the Monokai-an, a store specializing in exorcism, through a contact method she discovered by chance. There was the unhappy owner Abe Harusai. For some reason, Ashiya started working as a servant of Monokai-an... The story of Abe and Ashiya's exorcism team and the monsters began.