高中一年生小泉阳太，是个主妇型男性。由于双亲经营酒屋所以总是到早晨才回家，而家务就由阳太一手包办。不过这样的他是个妹控，对妹妹小泉光一直是重度溺爱。突然从双亲口中听说自己和妹妹不是亲兄妹，还没有从震惊中恢复，突然又因为意外与光互换了身体？而光不希望恢复原样？

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