I'm Hiroshi, 54 years old. My wife, Chisato, is 49. We have no children. Five years ago, we remarried after both being divorced once. My wife had a son from her previous marriage, who is now an adult and married. So, our relationship with her son is distant, like distant relatives, and we only meet every few years. Although we remarried at an older age, our intimacy has been surprisingly good, happening about once a week. However, I've always disliked children, and to be safe, I always used a condom during sex. Recently, my wife has become close with a friend she met through a women's group, and we've been getting along well as families. From our perspective, they're a couple around our son's age, but we surprisingly clicked, and I secretly looked forward to meeting them... One day, I witnessed a shocking sight of my wife...