Married for five years. Kimika, who is ten years older than her husband, feels anxious about the fact that she only has a short time left until she is of childbearing age. The couple's sex life has also become unsatisfying, leaving her sexually frustrated. Meanwhile, Kimika is Kokoro to her father-in-law, who always treats her kindly... Having opened the forbidden door, the married woman becomes pregnant with her father-in-law's child.