Newlyweds Hikari and Koki visit the father who raised Koki alone. The moment they meet, Hikari realizes he is the older man she used to see for money years ago. He threatens to reveal their past unless she becomes his woman for one night. That buried history—when he trained her into a sex-addicted toy—could destroy her peaceful marriage. To protect her life with Koki, Hikari submits to being taken by her father-in-law that night.