 If you liked
xxxHOLiC
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 ...then you might like
Kobato.
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They are both made by the same author and have a similar feeling. They both have supernatural elements and take place in the same universe and have great stories. They're mysterious and interesting, though quite different.
Drawn in the signature CLAMP art style, the protagonist is tasked with fulfilling a seemingly endless amount of requests to help citizens. They do this in the pursuit of a wish, and are aided by supernatural beings who come from other worlds into the realm of the living.