To save their gravely ill son, Akio’s wife Kana signs a contract to serve a wealthy man named Natsukawa as his sex slave for one year. Akio despairs over his helplessness and the fact that he has effectively sold the woman he loves. Videos arrive from Natsukawa every week, documenting Kana’s training from beginning to end. She starts out defiant, but gradually the pleasure and conditioning conquer her until even her heart belongs to Natsukawa...