In a cramped Japanese classroom, a group of schoolgirls, clad in their physical education uniforms, are supposed to be learning about the importance of exercise. But the tight, short shorts and sports bras leave them feeling restless and aroused. They start to touch each other, at first tentatively, then with increasing hunger. The room fills with the sounds of their moans and the rustling of their uniforms as they strip each other bare, their bodies glistening with sweat as they give in to their taboo desires.