Shirakawa Erina

The heroine of the story. She is a troubled child who was admitted to the school thanks to her parents' donation.

She is free-spirited and spoiled, and the teachers are unable to handle her. The principal of the school has finally decided to institute a correctional program, and Yoshito Inahara has been put in charge. She looks like a gal because of her playful nature, but her physical development is more than that of a gravure idol.