Yukari is 39 years old, married to a 42-year-old man. They've been married for nine years but have no children due to her husband's infertility. Despite this, they've overcome the hardship and continue to live happily together. However, the husband begins to feel a deep sense of guilt, worrying that he's failing to satisfy his wife. Gradually, his behavior changes and grows increasingly strange. Ultimately, he reaches an extreme point—begging another man to sleep with his wife, submitting to full NTR (cuckold) fulfillment.