 If you liked
Kekkaishi
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 ...then you might like
Tokyo Ravens
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Both series involve kids delving in onmyou arts(eastern magic). Whilst Kekkaishi are more about onmyou-type barriers known as kekkai, Tokyo Ravens focus on shikigamis which are pretty much helpers to onmyoujis(casters).
If you're into shonen-type anime(adventure, action) mixed with supernatural elements, make sure to check out both!