"Rio-chan" lives with her parents and grandfather, making a household of four, and she harbors a secret she can't tell anyone. It's a special relationship with her grandfather that occurs only when her parents are away. They spend time together in the bath, where he touches her body, and she's made to perform for him under the covers, her immature body gently yet forcefully toyed with. However, these acts also fill her with fear, leaving her unable to speak of it to anyone. Help... Mom... *No performers in this work are under 18 years of age.