Yuko Shiraki's sister came to visit her younger sister after a long time apart. While the younger sister went out to buy snacks for drinking, the sister stayed home with her brother-in-law. Seeing both of them sitting idly, the brother-in-law decided to take out some beer to quench his thirst. Just as he hadn’t finished the can, unfortunately, there was a power outage in the whole neighborhood, and the two sat together in the stifling heat, sweating profusely. Meanwhile, the sister-in-law lay there sleeping, causing the brother-in-law to unable to resist her alluring figure as she slept.