 If you liked
Ore no Imouto ga Konnani Kawaii Wake ga Nai.
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 ...then you might like
Watashi ga Motenai no wa Dou Kangaetemo Omaera ga Warui!
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Both anime include social outcast (sorta) female leads with otaku hobbies that are trying to fit into normal society. Both anime also include the older/younger brother helping their sisters to cope with their problems. Both anime have similar mood, although Oreimo is slightly more romance focused and Watamote focus slightly more on the social issues.