When Yumemi Hoshino finds out she's going to be staying with Moriya Tenko's family while her parents are overseas, she's overjoyed—after all, he's the cool, handsome, mysterious boy admired by all the girls and boys at her school, but whom she's never had a chance to talk to before. But things turn out quite differently from what she expected, as the Tenko family turns out to be a collection of oddball eccentrics who live a life where common sense has very little sway...