If you liked
Masca: The Tale of the Great Mage of Hessed
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...then you might like
Hanatsukihime
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Both are romance/fantasy about a girl whose heart is going to be taken by a demon when she reaches a certain age. Both are beautifully drawn with plenty of bishounens. However, Hanatsukihime is more girly/cutesy (and not nearly as good as Masca), while the latter is more mature.