Otool, who bears a striking resemblance to his sister, is forced to enroll in the Miife Girls' Knight Academy in her place after his super-genius sister suddenly disappears. Disguising himself as a girl to avoid being discovered, he quickly finds himself embroiled in trouble— “If only I had the powers of my sister… Help me, sis!” Otool cries out, only to awaken his 'Absolute Little Brother Ability'!? A dreamlike fantasy in another world begins, where he is spoiled rotten by the older sisters of the academy!
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