"Just once, I want Rio to pretend to be my lover...!!" My wife and I are stunned by the sudden request of my best friend, Yuu. Contrary to my reluctance, my wife Rio, who is dissatisfied with her monotonous daily life, is keen on the idea. If it's a request from my best friend... I decide to lend my wife out just for this once, but as Rio seems to be enjoying the preparations, I become more and more frustrated. I thought she would come back that same day, but it seems Yuu's mother took a liking to her and she's staying overnight. There's no way something could go wrong...