I don't know why Xebec chose to animate this brilliant manga when they didn't finish it in the end...
It's such a pity. The anime was a great adaption to the innovative manga and followed its story perfectly while also adding small things that enrichened it even more. The voice acting was lovely and the atmosphere was appropriate.
And then they somehow decided to finish it in an instant with adding a couple of random filler episodes that conntained stupidity to the max. It was dissappointing and made a lasting impression although the series hadn't been so bad before...maybe they will continue it someday?