The anime is good. Especially the first 4-5 episodes. It was a pure blood bath. The gory scenes was what I liked the best. The art and animation in them are just pure like masterpieces.
The story was interesting... I liked it. The humans relying heavily on science, while the witches are relying on magic and trying not to harm humans... Until the protagonist breaks out from his slumber by a girl talking like one of the heads men. That was funny.
The sounds are good too. I think. I liked the voices. They were good voice actors.
I recommend it.