After her husband passed away and her son moved out, Sayako Sanada lived a life of inertia in her unnecessarily spacious house, with no particular purpose in life. She spent her days in agony, until one day her son returned home, shocked by a broken heart. His sexual desire was on the verge of exploding, and he sought out his mother as a way to release it. Sayako, who remembered the joy of being desired by someone, awakened to a new sexual fetish.