Noa-sensei begins giving remedial swimming lessons to Shota and his classmates who cannot swim. Her students become completely obsessed with her large, perfectly rounded, beautiful ass, paying no attention to the lesson and fixated only on her figure. They repeatedly prank her by touching, groping, and sucking her buttocks peeking out from the edges of her swimsuit. Underwater, her jiggling hips sway enticingly, and by the poolside, her massive ass bounces wildly, drawing the students in deeper and deeper. The swimming class gradually turns into sex education, as the students continue to be captivated and tormented by their teacher's irresistible charm.