OBA-059 — My Friend's Mother - Noboru's Mother, Known As The "Dr. Pervert" At School - Suzune Yagami

Hiroshi admires his classmate Noboru, who continues to set pornographic trends at school. He buys pornographic books and distributes them to his classmates... Before he knew it, Noboru had been dubbed the "erotic professor." One day, Hiroshi finally gets to visit Noboru's house, which he has always wanted to do. Pornographic books are scattered all over the room... and Hiroshi meets Suzune, the biological mother of the "erotic professor." A few days later, Hiroshi is left alone with Suzune at the Yagami house...