"Let's keep it a secret!" Student teacher Momo gives a passionate lesson in a costume that perfectly matches her busty, plump body! But when she gets wet, her breasts become visible and the lesson can't begin! Sleeveless! Tank top! Bloomers! And other costumes that tempt students even though they don't want to! Peeping students! Virgin students! And so on, everyone's problems are solved with her breasts!