Nanako, a friend of his mother who runs an esthetic salon at home, came to help. His son, Seigo, couldn't help but feel a passionate longing for her beauty, which had only increased with age... That night, Seigo was captivated by her defenseless allure and ended up giving in to his desires. The next morning, Seigo, who was still troubled, couldn't help but confront Nanako, who seemed completely unchanged. Nanako writhes under the young man's intense caresses, but such a secret affair can't last forever...