Ataru was supposed to stay home alone while his parents went on a two-night, three-day pair trip that he won in a lottery. An acquaintance of her mother came and said that she would take care of the housework and meals... but what came was Yuna, a sexy woman who didn't seem to be an acquaintance of that sober mother. Ataru, who was obsessed with her beauty at a glance, managed to make her stay at her house. And Ataru and Yuna, a long and erotic night alone begins.
