This show is very bad, and not in the fun way. It's deeply disturbing, since it's nothing but extreme amount of violence. There's no good writing, no charisma in characters, animation is awful. All of the above could've been exused if there was some deep commentary on society normas and prison system, but there isn't any of that. Why this show needed to be done? The only thing I can think of (aside from creator's needs to sublimate some very problematic urges) is that it was intended as a show no one should actually watch, because of how bad it is. In that case, of course, it would be a great piece of art. Unfortunately, something tells me it's just an awful animation with nothing inside whatsoever. Why some people like it so much is beyond my understanding, but I will assume that it's because they are as problematic as creator of this piece of...culture.