I picked this Manga on my Reading Quest before I could for Tsubasa Chronicles. And Boy, it Turned out to be the Best Manga I have ever Read (till date). And it is one Criminally Underrated Gem!!
The story starts out as a simple one. Set in Heavens - ruled by a Tyrant - a prophecy about a certain guy who will defeat him - the main protagonist fulfilling that prophecy - road trip - meeting allies willing to help. Pretty Simple Right? Turns Out it Isn't!!
The first four volumes follow this and I found myself struggling through them. Of Course, being CLAMP's work (their debut at that) the Art is Great. But the pacing and progression didn't appeal to me. The deaths were sad but Ashura's constant whining irritated me. But, things change when I reached the fifth volume.
The manga goes to directions you wouldn't expect. Revelations were made during the course of the series which blew my mind. Deaths happened, a lot of them. Towards the end it made me feel like I am reading/watching one of Gen Urobuchi's works!! CLAMP makes you fall in love with the characters, before making you see them suffer.
In Conclusion, this is a great work by a great mangaka group. The story and characters would draw you in and make you read till the end (and potentially destroy you xD). I urge everyone reading this to give this Manga a go.