Mao-chan is a cheeky high school girl who loves to tease her virgin big (step)brother in naughty ways.
However, her true intention is actually...?
(Source: [BookLive](https://booklive.jp/product/index/title_id/20063387/vol_no/001))
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Note: the original Pixiv series has been collected and published into 2 volumes.
Volume 1 (上) \"Up\" contains chapters 1-20. Volume 2 (下) \"Down\" contains chapters 21-42.
