Interesting premise. At the start it intrigues you. You very quickly become disappointed as the storyline is very poor.
All characters look good, and there is some good use of CGI in places. Thats if everything stayed still. When it comes to the actual moving of the characters the animation is horrible.
The music used for the opening theme is good, and the soundtrack throughout is solid. The voices throughout are surprisingly good considering the poor standard of the rest of the anime.
The characters are O.K. They all kinda make sense and fit in. They all lack approachability and you don't care about what happens to them
Watch other things first. I would not recommend this to anyone