平凡內向的妹妹搖身一變，變成了擁有秘密帳號的開朗少女。身為哥哥，他理當給予妹妹教育指導！但看到可愛巨乳妹妹毫無防備的樣子，他忍不住插足其中！兩人意外地產生了默契，最後發展成如同戀人般的關係……這部人氣同人誌終於要被真人化了！
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