Around the age of a girl, Marina-chan was unknowingly worried because she couldn't keep up with the naughty topics of her classmates. One day, I took the plunge and visited the teacher's home on a holiday to have my teacher teach me about sex. However, the teacher is a genuine amorous teacher who goes to customs every week, and at first he was annoying Marina who visited the teacher's home to go to the customs reserved, but she is so persistent that she is curious. By taking advantage of it, she plays with her body during the development process, and Marina-chan also truly receives what the teacher says and gradually becomes dominated.