20th Century Boys, vols 5-9 - Naoki Urasawa
Yes, I'm still reading 20th Century Boys. Yes, I'm still loving it to bits. No, I still can't tell you what it's about.
Probably the best description of this series is that it's in the vein of expansive mystery TV shows like Lost - except that you never doubt that Urasawa has the whole thing planned out in meticulous detail, and he's also very adept at resolving minor mysteries when they've run out of steam or introducing entirely new branches of the plot.
The other thing he does well is audacity. Not just in the way he can convincingly introduce pretty much anything to the storyline, but also in the way he's quite happy to go straight from a scene of epic science fiction, say, to an everyday moment of personal drama - sliding effortlessly between what some might expect to be entirely disparate genres.
Recommended with all the commends I can rec.