Nakamura Nagisa, 36 years old, married for eight years. She met her husband through their shared hobby of mountain climbing, and they have a child together, living a quiet family life. However, her husband has become so engrossed in climbing that he shows little interest in sex, and they only have intercourse about once a month. For Nagisa, who is physically fit and sexually energetic, this is far from satisfying, and she begins seeking new excitement. After seeing a recruitment ad in a women's magazine, she decides to apply. With her husband, she always reaches climax just before orgasm, leaving her craving stronger, more intense sex that lets her fully experience ecstasy. Here begins her fulfilling encounter that will answer her deepest desires.