Asami is a beautiful teacher who is popular among her students. However, in her private life, she has been trained by her masochistic husband and has become a slut, raping his anus every night. One day, Asami finds a student secretly masturbating in the nurse's office, and plays a prank on him, making him her slave. She invites the student, who has become completely obsessed with her, to her house for a naughty extracurricular lesson...