After Sanada Sayako lost her husband and her son became independent, she lived in a uselessly large house with no particular purpose in life, just by inertia. She spent her days in agony, but one day her son came home with the shock of a broken heart. Her son's libido is on the verge of exploding, and he asks her mother where she can vent. Remembering the joy of being wanted by someone, Sayako awakens to a new propensity.
