Even if you don't look into the psychology of the characters or themes, the spectical and action are enough for a ten out of ten overall. The art is the best I have ever seen ever, every panel looks like it belongs in an art museum, and the action is incredible and realistic dispite the fantasy setting. Fortunatly there is a lot more to this manga than action and art. Each character feels like a real person with their own motivations and philosophy. It is very gritty and even gross at times so don't read it if you can't handle that sort of thing. I would definitaly recomend reading it.