故事发生在一个人数庞大的家庭之中，由于父母常常不在家，所以常驻家中的，是哥哥晴辉（阿部敦 配音）和他的四个妹妹。这四个古灵精怪的姑娘常常给晴辉制造各种各样的麻烦，让他这个做哥哥的焦头烂额，但兄妹五人之间的感情实际上非常的深厚。 长女梦月（明坂聪美 配音）身为家中最大的女孩，自然流露出一家之长的风范，可有时候又会有格外孩子气的一面。次女弥生（小松未可子 配音）四肢发达但头脑简单。三女羽月（徳井青空 配音）拥有非常可爱的外表和小恶魔一般的性格，常常将哥哥耍的团团转。四女咲月（堀野纱也加 配音）个性内向又害羞，是个标准的宅女。
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