 If you liked
Zettai Kareshi.
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 ...then you might like
Fushigi Yuugi
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The art is kinda similar, since it is from the same author.
As for the storyline, The way both stories ended is "sort of" similar ( sort of, meaning not fully) You'll understand once you've read them. Of course, they have different ending like one ended up in a happy ending while the other is somewhat happy and yet kinda sad ending..