One day, my mother-in-law suddenly came to Tokyo while I was living with my wife. Apparently she had been scouted to be an underwear model, and ran away from home to give it a try. My wife and I decided to let my mother-in-law stay at our house for a week to let her cool down. That night, on my way to the bathroom, I heard a noise coming from my mother-in-law's room... Wondering what it was, I peeked into the room and found my mother-in-law, who still had feelings for me, clad in lingerie. I couldn't take my eyes off my mother-in-law's seductive expression and underwear, which I would never normally see...