Powerful. More than once my jaw dropped. Sadly enough its only 13 episodes but an amazing 13. There is not just blood and gore (although there is a lot) there is also some drama and other elements that help balance the anime.
If you have an open mind, please please watch, i don't want to ruin anything, so I won't be saying anything else. If blood doesn't bother you watch this immediately and enjoy. One of my absolute favorites! 9.5/10