 If you liked
Nogizaka Haruka no Himitsu
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 ...then you might like
Ore no Imouto ga Konnani Kawaii Wake ga Nai
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In both of them the main characters have to deal with a society full of prejudices that looks down upon their otaku hobbies. In both of them there's a male character that finds about the secret otaku "identity" of the heroine, and furthermore in both the main heroines have a popular, social side that starkly contrasts with their hobby.