During the record-breaking heatwave of midsummer, I was unable to work due to a back injury, so I spent the time alone with my son's wife, Nao. I was transfixed by Nao, who was so kind, beautiful, and glamorous that she was too good for the son of an ordinary businessman. One day, with a fearless smile on her face, Nao suddenly approached me. Treating my body, which was immobile due to a back injury, as if it were a toy, Nao continued to shake her hips as if she were a different person...