In the single-mother household of the Tomoda family, the only son, Yuuji, works from morning to night to support the family financially. Meanwhile, Maki uses her son's absence as an excuse to start having affairs with his friends. Overwhelmed by the physical allure of younger men, she becomes consumed by lust. When Yuuji discovers the truth, he confronts her fiercely and confesses his "love for his mother." Though shaken by his feelings, Maki ultimately succumbs to her own desires.