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Hmm I might be able to think of something, there's this manga I got just last week called Dogs. It's pretty dark and complex while at the same time has some vulgar things in it. I'm not sure if that might be what you're looking for...then again there's a huge generation gap between us since I never watched or read any of the stuff you mention and I only know the gist of V for Vendetta.
I don't simply want dark and complex, I want real quality writing. Trust me, V for Vendetta (the book) is REALLY, REEEEEEALLY different from the comic itself. The point is pretty much completely different, the morals, the story... heck, they blow up the parliament in the first few pages, so the plot of the first movie is gone just like that. The point, the very point itself, is something quite good. From insanity expected from certain characters, no actual "battle scenes", and V being a symbol instead of a kind of vigilante...
http://updownstart.files.wordpress.com/2009/06/anarchy.jpg The whole thing has much more meaning. Politically AND narratively.
Although I am quite curious about this manga you tell me about.