Sae is in charge of health and physical education at an all-boys school. She is in a position to seriously teach sex education, but the boys of her age just make fun of her classes. Meanwhile, Sae is angry at the attitude of Maeda and Yoshinaga, who are the leaders in the class, and makes them stand in the hallway. However, in retaliation, the two pour water on Sae from a bucket they were given and play with her transparent body. Then, the two are suspended from school, and they hold a grudge against Sae, so in retaliation, they force her to wear transparent clothes and make her stand at the podium.