Six years ago, Kasumi's mother remarried and Yoshio became her father-in-law. For Kasumi, who left home soon after her mother remarried, her relationship with Yoshio was awkward. On the other hand, Yoshio was conscious of her Kasumi as a woman from the beginning of her remarriage, and even now when Kasumi became her wife, she could not get rid of her evil feelings. And then the incident happens. Yoshio, who was lusting for Kasumi on her way home, hugged her from behind and whispered in her ear, "She's become an even better woman."
