I want you to rub it, lick it, suck it, and mess it up more...! Ruri Ugajin, the daughter of the prestigious Ugajin family. She has a beautiful eyebrow at school, and she is late in her romance because she has been extremely talented. That's because she has a crush on Sakamoto, her exclusive gardener who has been with her from the old days. On the outside, she seems to be the daughter of a prestigious family, and has been interacting with her, but in reality she is a tomboy and has an unintentional attitude towards Sakamoto. At that time, her mother orders her to receive "night nursery education". "Yotogi education" is a practice of sex education that only women receive from the Ugajin family that has been passed down since ancient times. A long time ago, there was a case passed down from generation to generation that her ancestor committed a terrible blunder on the first night of her marriage and ended up in a catastrophe. Because Ruri looks just like her ancestor, it was decided that she would educate her early. She didn't think it was a joke that someone she didn't like and didn't know had her body as she pleased . To put it away, she goes to a remote house. However, the person she chose was not someone she liked or didn't know, but Sakamoto. When Ruri finds out that the person she likes has become her partner in night school education, she forgives everything and her instincts as a female are exposed. How far will she fall, and what will the two of them end up at the end of the sudden intense pleasure, even though they weren't even lovers?In the dim darkness, only the moonlight shines, on the tatami mats and futons prepared in the Japanese-style room .