A housewife who has been married for two years spends her days overwhelmed by household chores, with almost no time to exercise. Seeking relief from the stress, she joins a mothers' tennis circle. Gradually captivated by the joy of tennis, her relationship with the coach grows deeper. Becoming aware of her newly strengthened body, her feminine instincts begin to awaken. As her physical endurance improves, her pleasure intensifies dramatically—she climaxes repeatedly, gushing powerful squirts each time. Though aware it's wrong, her husband watches her transformed state and, unable to control his urges, she embarks on a path of infidelity and creampie-filled affairs.