In the steamy, dimly lit track club room, Fujima and Aya, two alumni, reminisce about their past exploits. Their conversation heats up, leading to a passionate embrace. A third presence, a student, enters, catching them in the act. Instead of interrupting, she joins in, eager to learn the secret lesson Fujima and Aya are only too happy to teach. The room fills with the sounds of their moans and the slapping of skin as they engage in a heated threesome, their bodies glistening with sweat.