Haru, a serious girl of marriageable age, was secretly worried because she couldn't keep up with the erotic conversations with her classmates. One day, she decided to go to her homeroom teacher's house on a holiday to ask him to teach her about sex. However, the teacher was a genuine lustful teacher who visits a brothel every Sunday. At first, Haru came to the teacher's house to go to a brothel she had reserved, and the teacher tried to quickly send Haru away, but she was too persistent, so he took advantage of her curiosity and played with her body, which was still in the process of development. Haru also took the teacher's words seriously, and gradually her young body was trained to do as the teacher pleased...
