Based on the erotic game by Frill.

White Lily Hill School is a public boarding school full of female students. But the school has another hidden side ... The High Class Prostitute. In school it educates women into high-class prostitutes to be able to grant men desire about sex. Most of her lecherous fantasy women are still locked in her deepest heart. There it is the duty of the educator to open her lecherous fantasies and bring the women to the surface to become high-class prostitutes.

(Source: Translated and Edited from Nekopoi)