In order to save the life of their son who is suffering from a terminal illness, Shinnosuke's wife, Nene, makes a contract to become a sex slave for a wealthy man named Kawamura for a year. Even though it is for the sake of his son, Shinnosuke laments his own helplessness in having sold his beloved wife. Every week, Kawamura sends him a video recording the entire process of Nene being trained, and although Nene initially puts up a strong attitude, Kokoro gradually becomes Kawamura's. A year later, the surgery is successful and the Tanaka family seems to have returned to a peaceful life, but...