The manga is a romantic comedy starring the clever and handsome son of a wealthy family. In middle school he only ever studied, and everyone said he was plain like a background character. When he gets to high school, he enacts a plan to change his image to be more like a "main character" and get the perfect girlfriend.
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(Source: Anime News Network)

The story revolves around Haruki and his four sisters: Mutsuki, Yayoi, Uzuki, and Satsuki. While their life may seem monotonous—aside from the fact that Haruki's sisters don't give him a single opportunity to rest, lecturing him about every perceived mistake and playing tricks on him—Haruki still likes his life.

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