Kiho, a teacher, is serious and modest, and has lived a quiet life with little interest in sex, never masturbating. One day, on the commuter train, he encounters a molester. The pleasure he feels increases as he is touched in secret, but the tension that keeps him from making a sound slowly awakens the uncontrollable lewd feelings that had been sleeping deep inside. The immoral act that contrasts with the serious teacher face he shows to his students. Before he knew it, Kiho...