"My nipples seem nhạy cảm today...?" The hands of evil creep up on high school girls as they go about their everyday lives... Invisible men who no one can see play with their nhạy cảm nipples without them noticing! They don't care if they're on the train, in class, or in the library! To top it off, they even pinch their cứng nipples while they're having tình dục with their boyfriends...?! Welcome to a mysterious world where you're not allowed to feel anything!