This, I've got to say is one of the most gripping animes that I had watched. It's one of those that make you want to be one of those people that constantly comment for a second season! The art is amazing and the characters have a brilliant backstory.
The plot is so different then the typical anime's nowadays, running as far away from a highschool as you possibly could(aka: a whole different goddamn world). It has a great mix of comedy and action, taking advantage of the different characters personalities.
So basically it's an anime that I would thoroughly recommend to anyone who likes No game No Life, etc. ect.