To save her son's life, who suffers from a serious illness, Kyohai's wife, Karen, enters into a contract to become the sexual object of a wealthy man named Suzumiya for one year. Kyohai laments his own helplessness, having to sell his beloved wife for the sake of their son. Each week, videos sent by Suzumiya show Karen being trained, and although she initially displayed a strong attitude, she gradually becomes completely subservient to Suzumiya...