To save his son suffering from a rare disease, Shinji's wife, Zero, enters into a one-year contract to become a sex slave for the wealthy Gentou. Despite doing it for his son, Shinji laments his own helplessness in selling his beloved wife. Every week, videos sent by Gentou record Zero being trained in their entirety; initially defiant, Zero gradually surrenders her heart to Gentou as well. A year later, the surgery is successful, and the Ainoya family seems to have returned to a peaceful life...
