Yoshino, who recently moved in, spent every day in a lethargic state in his room. One day, when I was looking out the window, I saw my neighbor Yuka hanging her laundry. Yoshino, who was fascinated at that moment, made it a daily routine to watch Yuka doing laundry, but she was always concerned that the sheets with clearly unnatural stains were drying in the laundry. And when I looked next to me as usual, I saw Yuka masturbating while squirming with sheets in the bedroom.