A private tutor falls into the trap of a flat-chested girl and accidentally steals her panties. When she asks, "You masturbated with my stolen panties, didn't you?", he has no choice but to confess. If he masturbates in front of her, she will let him off the hook, but if he refuses, she will tell his mother. The private tutor has no choice but to comply, but a cruel fate awaits him...