One day toward the end of summer, my wife and I were planning to enjoy dinner with my wife's family. My sister-in-law, Mizuho, is beautiful and has a great figure, and I admire her, even though I feel bad for her. While my wife went to pick up my mother-in-law, I was left alone with Mizuho... Seeing how nervous I was, Mizuho handed me a beer, but at that moment, a large-scale power outage occurred. Due to a sudden accident, I ended up spending the night with Mizuho, but she was afraid of the dark and wouldn't leave my side, so I couldn't control my reason...