Hummm. Started this manga way back in the past, when only the first volume (0) was out, mostly as something found as suggested to be like Berserk. Finally after many years I decided a handful of days ago to read it fully. It was quite good. One thing I agree with some people, that seem to have pointed out, is that the ending is... uhhh... meh? Not that it is reason to not read it., but it left me blinking. It felt more like that the final volume was rushed, if anything. Like there should be at least one more volume, but they were told to bring it to a close in one.
I am very, very, veeery lenient with weak stories and probably I am not one to rate about details, so I can only speak of how I feel about it. It was good. If I did not feel the final volume was rushed, I would probably rate it a 9, but I will rate it 8.
If anything, I want to point out is has absolutely nothing in common with Berserk. I could argue how the concept of the main character getting tricked by others so they could step on their corpses and get power, or how one of the main antagonists might resemble a bit what happens in Berserk... but no. I can't say they are alike just for such small reasons. Some seem to feel they are alike because of the gore and sex, but to me that is like saying Berserk is like Conan the Barbarian. Still, if it is for an itch, it might help, although personally I feel Berserk is a beast on it's own, so I doubt it.
I know I am repeating myself closing this comment, but I feel sad that the last volume felt rushed. It was a.. good read up close to the end, wit the final battle and the conclusion of the story feeling lacking. I recommend anyone that reads it to read at least 2 volumes. If the main character and the story does not make you feel interested, then this is no for you. I say that mostly because I did not feel it got better and better over time, but more like a bit less interesting, but not really. Reminds me of the usual stories where the main character goes around having different adventures by himself of small groups and then after a point it is war with bigger and bigger forces.
PS: To people that praise it over Berserk, it is probably because you are looking for something totally different than Berserk. This does not have the intense power of Berserk, but if I had to point out something better... is that it has eventually ENDED.