Akutsu Masatora, a demon on a mission to recruit allies for Hell in their ongoing conflict against the angels of Heaven, strategically infiltrates a high school in the human world. His attention is captivated by Lily Amane, a recent transfer student, and he becomes enamored by her beauty. Akutsu intends to enlist Lily as an ally, only to discover that she harbors secrets beyond his initial perception.
In an unexpected twist, Akutsu not only becomes an unwitting accomplice to one of the supposed adversaries he aims to combat but also grapples with the possibility of developing genuine feelings for Lily.