就读小学5年级11岁的小男孩宫川 あつし，不知为何却已是一个长得大人的模样，且身高达到180cm！这幅模样为他的日常生活带来了各种各样的麻烦事。与此同时，他还有一个17岁的姐姐，宫川 あつみ，目前是高中2年级。但是这个可怕的家庭才给了她137cm的身高，而且拥有萝莉的体形！虽然是这样，但是姐姐还是尽自己的能力照顾着弟弟。
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