I was disappointed and confused to say the least. The pacing is too fast. 13 episodes is too short for the story to properly unfold and to establish the characters as anyone you actually care about. Firiel and Rune get the most screen time, but never develop much. There's a lot of politics at play in this story, but there isn't a lot of time spent really establishing points of view or importance of different factions. The world building could use some work, too.
The animation is quite pretty, and the music is all right, but ultimately it isn't enough to make up for shallow characters and a rushed plot. I might try to track down the light novels and see if that helps.
