高校のクラスメートである神崎賢人、堂本明、瀬川奏太には姉がいる。 賢人の姉・美姫は暴君、明の姉・茜はお子様、奏太の姉・栞は過保護という、 タイプが違う姉に、3人はそれぞれ幼い頃から振り回されっぱなし。 さらに高校も一緒のため、気を休める時間もない。 なんとか立場を変えようと考えてはみるものの、 幼いころから刷り込まれた姉への恐怖が消えるわけもなく……今こそ立てよ弟! 3組の姉弟が織りなす姉弟コメディ!
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