Chika

The adult man who cares for Mana. He hosts the appraisal meetings, runs the sex-education lessons, and has sex with Mizuno.

Akasaki Mana. After her parents died in an accident she lives with her uncle and joins the appraisal meetings, spreading her vulva, urinating on command, and receiving penetration.

A boy from the same class. Attends for the first time with Maruyama, receives Mizuno's sex lesson, and penetrates Chika.

Chika's father and the school vice principal. He attends the appraisal, helps explain sex education, and touches the girls' genitals.