Misaki Akane has been on her own since she was a little girl. Therefore, it is nothing unusual for her to rent her own flat. But the old landlady forgot that the flat is already rented by a man. Since there is no other flat available at the moment, the two agree to live there together for a short time. The whole thing would be unpleasant enough without unwanted incidents, but first, the older man accidentally sees her changing and then catches her masturbating after being turned on by the sounds of her neighbours sleeping together...