I was really disappointed in this manga. When I read the back and the first few pages, I thought, "Hmm. A real historical setting with demons and gods thrown in? Interesting."
It was NOT really interesting. Seto's falling in love with Marie was apparently supposed to go without saying (I really wouldn't have guessed he had if it weren't so predictable from the start), and so were her feelings for the prince. The characters were all really dull, and there wasn't much plot. Most importantly, it was very silly and immature, when I had thought by the setting that it would be slightly more serious and historically authentic. I prefer a touch of solemnity to something that's supposed to foreshadow a tragedy. It wasn't just silly, it was silly in a painfully cheesy, stupid way, and it was really, really boring.
I don't think it's worth the time to read, and definitely not worth the money to buy.