Eriko is overwhelmed by daily sexual frustration and finally ends up having sex with her own son. Knowing it's too late to regret, she can't stop her impulses. Her obsession with her son grows deeper each day, and her desire to be held by him again becomes uncontrollable. But tonight, her husband is home, leaving her with limited opportunity. While her husband takes a bath, she resolves to fulfill all her desires within a brief 15-minute window.