男主角落合洸太独自回家的路上出现了迷一般的美女大姐姐，并因为一支雪糕发生了间接接吻。 在这之后，由于洸太的父亲工作关系，洸太不得不独自生活，但这时候，那位大姐姐再次出现在洸太面前，并要求入住落合家照顾洸太。 而洸太由于性格关系无法拒绝这位名为萩原夏树的17岁女高中生。 于是发展成了洸太和夏树的同居生活。

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