I really think there'll be more to it, even though I agree that this will be a everybody dies series. I think we'll see a little bit of romance, and the fact that the prince seems sketchy makes me think that there'll be some sort of struggle that opposes him. The manga seems to be of historical nature, so some historical event or issues may very well be integrated in the story.
It took me a while to get used to the art, but right now I think it's very well drawnI read some of it, and I was totally weirded out by the art and the content. It had a part with a weird bishie holding a blade and dancing around with it between his toes. I was totally weirded out. Among the weird amounts of gore and intestinal grabbing.