Not a single scrap of violence anywhere. Sounds boring, but it’s not. Haibane-Renmei derives its world through original takes on a mix of religious theologies and comes up with a winner. You’ll discover some darker undertones as you get to know why the Haibane are there. The dark stuff never become a focal point of the story, but rather how the Haibane move forward.
Be warned, this is one of those stories that leaves a lot of interpretation up to the viewer.