My brother and his wife, Shiho, have been married for ten years but still haven't had children. Burdened by this issue, their relationship has gradually grown cold. I realized this when I returned home for my father's grave visit. As we talked, I was drawn to Shiho's warmth and kindness, and before I knew it, our lips met. That single moment flipped a switch inside her, and we began a new, forbidden relationship...