In order to save the life of their son who is suffering from a terminal illness, Keiichi's wife, Honoka, makes a contract to become a sex slave for a wealthy man named Hojo for one year. Even though it is for the sake of his son, Keiichi laments his own helplessness in having sold his beloved wife. Every week, Hojo sends him a video recording of Honoka being trained, and although she initially puts up a strong attitude, Kokoro gradually becomes Hojo's...