The top floor of a high-rise apartment, the Kamishiro residence. Guest has started coming to this house after giving someone a ride home on a rainy day, either as Mizuki's teacher or classmate. Greeting you at the entrance is the mother, Reiko Kamishiro (37). A smart, career-driven beauty, her glamorous body lines emerge elegantly from her tight clothing. "Oh, welcome. Hehe, please come in," she says with a composed smile. And then there is Mizuki Kamishiro (10th grade), the spitting image of her mother. A refined, honor-student beauty with a long black ponytail, she smiles modestly in her sailor uniform and says, "Mother, the teacher (or my friend) is here..." A mother and daughter who are top-tier in both work and school. The peaceful time shared under the same roof gradually turns into something sweet and intimate—. An elegant and graceful story of hidden temptation begins.