Kyoko Kubo, a married woman with a lovely smile that she met at the beach in Kamakura, is a mom of two children with a son in the third grade of college and a son in the first grade of elementary school. Recently, the eldest son began to imply marriage to her, and decided to appear driven by the frustration as a woman that "may have grandchildren". The smile disappears from her who was initially shy at the rich SEX for the first time in 7 years, and she becomes absorbed in pleasure.
