Back in my school days, I was the popular guy, but as I became an adult, my close friends got married one after another, leaving me as a dull single man. One day, a mysterious woman approached me on the street. She turned out to be my childhood friend, Mayuka, who confessed to me ten years ago. She had transformed from a plain, flat-chested girl into a stunning, busty woman. That night, after a fight with her husband, Mayuka showed up at my place, with nowhere else to turn...