This was a truly amazing 12 episodes, I didn't like the recap episode, in all honesty, but in my honest opinion I have to say, this is an amazing series, it's not for everyone due to the topics (obviously) but it really is something a lot of people could probably enjoy.
I loved the animation, story, art, the music used and the sound design. The characters were just amazing and have unique design, story's, backgrounds and overall have their own bits and pieces.
I enjoyed this a lot and (without any spoilers) am quite disappointed at the special. I recommend you watch this, but I'm warning you that the "special" episode is fairly disappointing