One day, 10 years after losing my beloved wife, my son suddenly brought his girlfriend, Misaki, home. It was the first time since high school that my son had brought his girlfriend home, and as a parent, I was very happy, but Misaki was a generation, no, two generations older than my son, and I couldn't hide my confusion. Furthermore, for some reason, we ended up living together for a while, and before I knew it, I had started to follow Misaki, who looked after me as if she were a wife...