In the midsummer, when the hottest summer months were constantly in record time, I was unable to work due to my back injury, so I was spending my time alone with my son's wife, Nao. I was captivated by Nao, who was so kind, beautiful, and glamorous that it would be a shame for the son of an ordinary office worker. One day, Nao suddenly approached, with a defiant smile on his face. While treating my body, which has been hurting my back and is unable to move, like a toy, Nao continues to shake her hips as if she has changed...