Princess 69

The first part of this story is about girls who are practicing gymnastics. Doguro Nikusuke, a former famous athlete and now a gym teacher at the girls' academy, comes into their lives. He feels he is an inferior person in the eyes of others.

Tomomi, the local star of the academy, controls him using pressure and blackmail. With his help, she plans to take revenge on five girls, including their class teacher.

Of course, the plot develops according to the laws of the hentai genre. All of our gym teacher's dreams come true right before his eyes...

Here comes the end of the first part of this story.