Megu, a school nurse, is a beautiful teacher who is popular among the students. However, in her private life, she has been trained by her masochistic husband and has become a sadistic woman, to the point of raping her husband's anus every night. One day, a male student at school who has become interested in anal sex comes to her for advice, and she gently teaches him how to do it, making him fall in love with her. She invites the student, who has become completely obsessed with her, to her house for a naughty extracurricular lesson...