来年卒業を控えたりむと彼氏のゆうた君はキスまではしたことあるがその先はまだない。身体の関係は大人になってからだと約束していた。彼氏の家に遊びにきたりむは、ゆうたの父親とおると出会い、まるで娘のように優しくされる。その日、電車が止まって帰れなくなったりむは急遽泊まることになる。翌日、ゆうたがいない隙にとおるは、りむに媚薬を盛る。
As she approaches her graduation next year, her boyfriend Yuta has even kissed her, but nothing beyond that has happened yet. He had promised that they would have a physical relationship only when they were adults. When Rimu comes to her boyfriend’s house to play, she meets Yuuta’s father, Toru, who treats her as kindly as if he were her daughter. That day, the train stops and Rimu is unable to return home, so she suddenly has to stay overnight. The next day, while his girlfriend Yuuta is away, Tooru gives Rimu an aphrodisiac.

– JavGG.net