 If you liked
xxxHOLiC
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 ...then you might like
Amatsuki
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Well..both involve supernatural stuff and demons..but still they are really different stories.What they have in common is the "feeling", both stories make you wonder the meaning of reality and dreams (or fantasy);what are the boundaries of what is real and what is not? This is where you find the real similarity, they make you think a lot and sometimes they give you a hard time to understand what's going on.
So if you want something to "think about" this one is a very good option too.