 If you liked
Cardcaptor Sakura
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 ...then you might like
Ran to Haiiro no Sekai
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Both series have magical girl elements and involve a little girl with an overprotective older brother. The girl is naive but kind and a tsundere boy in the same class falls in love with her but has trouble expressing it. The boy also is in on the girl's magical secret and helps her out when she gets in trouble. There's also a larger ongoing plot that gets more complicated as the series goes on.