One day, while my stressful job had just transferred me to another distant location, my uncle decided that I could stay at his neighbor's house, Yumi-san, until I found a new place to live. She was always very serious and worked as a nurse, so she often looked tired even during her free time. However, one night when I accidentally saw her masturbating passionately with a vibrator after finishing her late shift, all my fantasies about this innocent and meticulous aunt came crashing down! Unable to control myself any longer...
