Beautiful and solid book. Paints a great world, gives everything you need to start adventuring. Uses a class system, but it's easy to figure out.
The DM PC is actually a character in the story, and gives the DM mechanics by which to manipulate the story. I thought this was a pretty cool idea, and it fits the setting.
There are two things about this book that I did not like. The first was that while the mechanics are clean and simple, some optional sub-systems would have been nice. The second was that while I loved everything the book game me to work with, I wasn't really sure what I should be doing with it. There's some sample arcs, but they're a bit weak.
Fact is though, I can always find sub systems to add in and re-watch some old anime to steal ideas. My complaints aren't huge, this book is a must have for any whole like a rules lite version of D&D with a strong anime/JRPG bent to it.