This is absolutely fantastic in every way. The art is gorgeous, the setting is incredibly well crafted, the characters are three-dimensional and likeable, the story is excellent, the action is appropriate and well done, and even the dubbed voice acting shows careful time and attention. It's just long enough to do what it needs to do, with virtually no filler, and it has a satisfying ending that wraps up all the loose ends that need wrapping. As a final note, the fight choreography is the best I've seen in an animated series, exceeding even something like Avatar: The Last Airbender. If you have any interest in anything tangentially related to the series, you owe it to yourself to check this out, and even if you don't, this is the rare offering that is likely to be appreciated even by non-fans of the genre.