Meh, so-so. A little too cliche for my tastes, personally.
Insecure 'tomboy' (really, the only thing even slightly manly about her is her liking basketball and her short hair) almost instantly falls for hot bishie who perfect in every way, except maybe a little naive.
They go through typical couple problems - and, of course, Chihaya is always at fault for these problems (getting jealous, being 'selfish', etc, etc.), never Ryu.
One problem I have with this manga is just the sheer stupidity of the main character. I mean, she agreed to become his fiance, and eternal partner, in order to save her father from death. Seriously, that's why. And it's shown later that she could have broken the engagement at any time after that. But no, she seems to have absolutely no qualms about this afterward, and is totally happy that she gets to love him forever, even though she displayed fear and dislike for him before that. Why?
Another problem is that there's no real serious love rival - it's obvious that Ryu and Chihaya will only choose each other, which should be sweet, but is usually just annoying, with the way it's done. It makes for a boring story by way of romance.
It's like, the way things will end up is obvious from the very first chapter - Ryu and Chihaya, love-love forever up in the heavens, blahblahblah. I'm barely to chapter four, and I'm already bored.
The only original thing is that Ryu is a weather dragon - which had potential to become interesting, but really only contributed to his annoyingly perfect, Gary-Stu character. Yawn.
All in all, I would have to say that if you're looking for a new and exciting shoujo with great characters and an original and interesting storyline, run from this with your tail between your legs. But, if your looking for some typical shoujo cotton-candy sweetness with no worries about whether the two main characters will ever end up together, this manga is for you.