I have lived quietly with my only son. My husband is no longer in this world, so I've raised my son all by myself. Lately, as my son has grown independent, a deep sense of loneliness and emptiness has begun to fill my heart. That's when Santos, a foreign exchange student from South America, started staying at our home for a few weeks. His outgoing, bold personality and lewd advances bring a storm into my peaceful household, gradually awakening Yumi's long-dormant feminine desires.