Yuko was shocked to learn her only daughter, Shiho, had a boyfriend, leaving her with complicated emotions. That day, Shiho's boyfriend, Shunpei, was scheduled to visit their home. During his first visit, Yuko felt relieved by Shunpei's sincere and gentle demeanor, despite their age difference. However, on his second visit, something felt off—though he had promised not to touch Shiho until she came of age, his behavior suggested otherwise. Sensing this, Yuko noticed the change and proposed a secret arrangement. What unfolds next takes an intense and provocative turn.