In this story, Aiha loves her stepfather but she has always been uncomfortable around him due to their complicated relationship. Despite these feelings, she decides to support his remarriage for practical reasons. However, what she doesn't know is that her stepfather married her mother solely because he desired her young body. Today, while her mother is away, her stepfather continues to teach her about sex against her will...

ひなたは義父が苦手だ。生活の為に複雑な気持ちを抑え再婚を応援することを決めたのだが…しかし、義父が母親との再婚を決心したのは、連れ子のひなたの幼い身体が目的だった。そして、今日も母親の居ぬ間にひなたに性教育を施す義父、気弱なひなたは拒むことが出来ず義父の言いなりになっていく…。