 If you liked
Kono Naka ni Hitori, Imouto ga Iru!
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 ...then you might like
Kawaikereba Hentai demo Suki ni Natte Kuremasu ka?
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Hensuki is like a simplified version of this anime, but with a pervier side.
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Recommended by BrownieFan
Harem shows, but with a little added mystery. Our main bro has to uncover the secret one of the girls has. In HenSuki its the person behind the love letter, NakaImo its one of the girls being his sister.