that's one of the things make
Naoki Urasawa so special. He is a master in telling stories across a long period of time and switching to different locations on the way. 20th Century Boys further develops this "space-time switching/jumping" story-telling technique that stories are told back and forth in time and locations are switched across the whole world. Now 20th Century boys already spans 2.5 generations from the 1970's to 2018.