To save their gravely ill son, Hitoshi's wife Hibiki signs a contract to serve a wealthy man named Hosokawa as his sex slave for one year. Though it is for their son, Hitoshi despairs over his helplessness and the fact that he has sold the woman he loves. Videos arriving from Hosokawa each week record every stage of Hibiki's training; defiant at first, she gradually submits to him in both body and mind.