First things first, It's not finished. There's 13 episodes out, and 2 more need to be released before it's finished.. and it looks like it's going to be a few months before those two episodes are released. I'm praying that they come out before march.. Some episodes didn't even have the animation finished, and that's supposed to be fixed on the blu-ray releases iirc.
Okay, now that that's been said.. this is by far my most favorite anime ever. It's, imo, better than the manga I recently posted about (Onani Master Kurosawa). It's based on a light novel and animated by shaft. If you watch it, I recommend you watch everything closely together, because if you take breaks in between episodes it can lose some of it's awesomeness. In fact.. I'd recommend that you add this anime onto your "to watch" list and just wait for it to finish.. because then it will be so much more amazing.
To those of you who have started it/watched it; do you agree with me that this is the most awesome anime evar; or is it just that it contains all my favorite personality fetishes.. :3