I had very high expectations due to Okamoto's previous work Elfen Lied so I was hoping that this was going to be just as good, but unfortunately, I was let down quite a bit. The first few episodes had striking similarities to Elfen Lied and I actually enjoyed them, but after the fifth episode it felt rushed and was all a big mess.
There was little to no character development which meant they were unbearably bland and some story elements were handled clumsily, which lead to a very disappointing and anti-climactic ending. This goes to prove that trying to fit a 100+ chapter manga series into 13 episodes is a complete and utter catastrophe.
The only thing I ended up liking was the first opening.