In her nightly life, Mai Ko Kashiwa is a greedy wife who demands a second round from her husband. Her aging husband, weakened by lack of exercise, repeatedly rejects her advances, but Mai Ko stubbornly refuses to give up her desire for fulfillment. One day, she accidentally catches her son masturbating. Pure and physically fit from the soccer club, Junichi cums once yet quickly jerks off again, showcasing his incredible stamina. Witnessing his virility intensifies Mai Ko's sexual frustration, and she finally succumbs to temptation, reaching out to her own son. The story unfolds with her inner turmoil and the complex bonds within the family.