One day, my mother-in-law suddenly came to Tokyo while I was living with my wife. Apparently, she was scouted to be an underwear model and wanted to take on the challenge, so she moved out of her parents' house. My wife and I decided to let her mother-in-law stay at our house for a week to cool off. That night, on my way to her bathroom, I heard a noise coming from her mother-in-law's room. Thinking something, I looked into the room and saw my mother-in-law wearing lingerie.