Based on the erotic game by POISON MOTION.

The school nurse, Yoshito, has a secret plan to correct problem students through "counseling." It involves controlling their minds with a hypnotic drug. Students who are given this drug are rehabilitated, but girls may become his sex toys... Meanwhile, the principal gives him instructions to deal with Erina, the most delinquent high school girl at the school. Together with his assistant and servant, Seika, Yoshito tricks her into putting her under hypnosis, and then he plays with her body at will, destroying her dignity.

(Source: Parabook, translated)