Slightly original though the characters are not very realistic. The story is pretty simple. See bad guy, beat bad guy. Expected a lot more with the plot, but was sorely disappointed.
I didn't mind the story since it contained everything I like in a mature series, action, sex, blood, guns, knives, swords, and death. A bit too much nudity. Now, I love breasts like every other straight man, but the women are fighting nude all the time. They take off their clothes in one unnecessary dramatic scene, showing off their full body tatoo. Wonderful, like the artwork, but you could have killed 'em with your clothes on too. Shameless fan service.
Romance was unrealistic, even Bond wasn't able to have sex with every single woman in the movie. Not so with Freeman. I really didn't like the granddaughter of the former leader of the 108 Dragons. Lard Ho'. 😛 The second ugliest character after the creature in Girls Saurus.
Action was well done. Easy to follow, but dispensed a rinse and repeat routine (the knife with the feet, got a bit repetitive). It was cool the first time, after the fifth or sixth time, meh.
Characters were bland and one-dimensional. There's no character development; everyone is static. The dialogue is contrived, though it may be because of a poor translation, but I seriously doubt it.
Good manga, but could have been great. This is not one of those series, where you can't wait to the finish. This is only to kill time, which it did with outstanding ability.