So... this was kind of a return to form. I wasn't happy with the developments of the previous book, but this one managed to change my mind back, and I'm starting to enjoy all of the jumping around, twisting and flipping of the whole concept once again. The jailbreak plotline gets wrapped up mercifully quickly, then we get an extended flashback that finally sorta kinda explains what happened in the big showdown on the new year's eve 14 years ago, and then another new plotline gets introduced, together with a new character — a schoolgirl who raises some doubts about the Friendship party and gets sent in a brainwashing camp. I liked this storyline and the reintroduction of the older ones, though I was kinda disappointed that the grown-up Kanna and the young detective from the previous book were barely in this volume.
Reading this volume I've been thinking that this series is so very Lost (the TV show). I can see a lot of 20th Century Boys DNA in Damon Lindelof and Carlton Cuse's creation, and although I think Lost did a better job with a very similar balls-to-the-wall, no idea is left unexplored, anything goes-type storytelling and structure, I absolutely admire Urasawa's boldness with his choices in this book, as well. Its scale is so vast at this point that it's impossible to easily summarise, and you really don't know what to expect with every new chapter. And while not every choice lands perfectly and smoothly, it all contributes to the unique feel and style of the book, creating a one of a kind reading experience. I'm glad I decided to stick with the series after the disappointment of the previous volume, and can't wait to see what's coming in the next one.