In order to save the life of their son who is suffering from a terminal illness, Shunsuke's wife, Yuu, makes a contract to become a sex slave for a wealthy man named Tezuka for one year. Even though it is for the sake of his son, Shunsuke laments his own helplessness in having sold his beloved wife. Tezuka sends him a video every week, which records the entire process of Yuu being trained, and Yuu puts up a strong attitude at first, she gradually begins to own Tezuka's Kokoro as well...