Mikoto started attending an all-girls school, and due to the influence of those around her, it became natural for her to have romantic relationships with women. Of course, sex was also invented for Mikoto by women. Yuki, who raised Mikoto alone, is a laid-back girl with a dynamite body who loves men. The two of them suddenly discover that their relationship is more than just that of parent and child...before they know it, their relationship is escalating rapidly.