Okay, for the benefit of people like Cosmo Landsman, the chaps in the poster up top, were once the children in the picture above, and the story actually begins here, and using kinematographic effects, we are miraculously transported back to that time as an illustration of the central character's memory - this is actually a fairly common technique.
The "bewildering" jump forward at the opening of the movie, where a cartoonist has been imprisoned for drawing an innapropriate cartoon, clearly drawing parallels with contemporary matters and hinting at an authoritarian regime, is pleasing cleared up when the movie ends, sometime in the future, in that same prison. So that's so not "bewildering" is it, unless you didn't actually watch the entire movie?
Not that the movie would struggle if the easily bewildered stayed away, and the only people who placed their bums on the seats where those who bought the 20 million copies of the 20th Century Boys manga that have been sold in Japan, and the many people in the West who have read the scanlations, and have gone on to pick up the newly translated manga. Urasawa's fans alone will surely bring the movie, and the subsequent DVDs, a level of financial success few movies attain these days.
I can hardly contain my excitement, the trailer for 20th Century Boys 2 is out, and it's tacked on to the end of the trailer for 20th Century Boys, below. Unlike the Sunday Times reviewers, I'm very much looking forward to the rest of the trilogy - bring it on.