 If you liked
Toaru Majutsu no Index
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 ...then you might like
Ore no Imouto ga Konnani Kawaii Wake ga Nai
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Naturally, Index and Oreimo are both different kind of anime (Oreimo has a realistic comedy plot, Index has a futuristic fantasy plot). But in both series we have a normal young main character (Touma / Kyosuke), a guy who uses to be very quiet and tries to help his friends to any coast, specially women. However, this guy often has to deal with a tsundere girl (Misaka / Kirino), who usually annoys him and doesn't accept his "womanizer" lifestyle. Oh, and both girls tries to hide her childish likes