Living under one roof with a demon who aspires to be a literary master! Maki Daigo is a young man whose bonds with people have been weak his entire life. One day, a strange man calls out to him and asks, “How ‘bout you help me with my work?” The suspicious but beautiful man is Ichii, who is actually a demon! Ichii’s dream is to become a literary legend in the human world, and he’s finally accomplished his debut as an author. So Maki becomes Ichii’s vassal after signing a contract with him. Since Ichii can’t show his true form when it comes to work matters, Maki’s job as Ichii’s human substitute is to pretend to be “Tsurumaki-sensei, the author.” Then they start living together, but…!?