'Osanai Taro' has a girlfriend named 'Sayoko' whom he has been dating for three years. He proposes to her on her birthday and they happily become engaged. But the afterglow of happiness does not last long. 'Once you register the marriage you will not be able to do anything, right? You should get your playing done while you still can!' Feeling a strange persuasiveness in his colleague's words, Taro ends up booking a delivery health service. There he meets the sex worker 'Emiri'. The dangerous play with her ends up greatly shaking Taro's fate. Because 'Emiri' is none other than Sayoko's mother 'Kimura Asako'...