Mature beauty Ryouko Kurotani faces a shocking turn of events as she unleashes the pleasure of anal stimulation. To protect her position as a teacher, she had severed ties with her past—when her father called her "Sodomite" and subjected her to anal training. Yet her body never forgot the ecstasy, and each time her father reappears, hidden memories of anal pleasure resurface from deep within. Eventually, she finds herself craving a male colleague's cock in her own anus. As Ryouko sinks once more into anal obsession, she's caught masturbating in the school infirmary by one of her students...