I was living a peaceful life, embracing my wife and young daughter. But recently, I grew close to Mitsuha, a mother from my daughter's kindergarten, and we began sharing our personal struggles. Our conversations mostly revolved around issues with our respective husbands. Gradually, we drew closer—until one day, we crossed the line. The sex, driven by our mutual attraction, was shockingly unforgettable. Afterward, we established a rule: once a month, two hours of secret intimacy. Respecting each other's feelings, we continue building this new, forbidden relationship.