When I reached my mid-forties, I married my younger wife, who was a childhood friend. Contrary to me, who is impatient to have children, my wife does not respond to my night activities because she is busy with work. In the end, I said that I would put up with it for a month and I would do it. And a month later, I couldn't have sex with my wife, and I was returning home to celebrate the enrollment of my sister-in-law, Ichika. When I was spending my time suppressing my sexual desire that seemed to explode, my sister-in-law Ichika approached me many times with a fearless smile.