Newlyweds Hikari and Koki visit the father who raised Koki by himself. The moment they meet, Hikari realizes he is the older man she used to date for money several years ago. He threatens her: “If you want me to keep our relationship secret from my son, be my woman for one night.” The past she desperately wants to erase—being trained into a sex-addicted toy—now threatens to destroy her peaceful marriage. To protect her life with Koki, Hikari lets her father-in-law take her that night.