Originality
What can one say? It's genre fiction: the hunt is on for the serial killer.
Artwork
Very clear, realistic and professional artwork; well-composed frames. Nothing stylistic nor artsy but that's not the focus. The story is the focus and boy does it rock.
Story
I just love the pacing of this story. Urasawa has really quick but evocative transitions between the different panes.(view spoiler)