20th Century Boys was a manga about the power and danger of nostalgia. It was a story about a group of childhood friends who grew up in 60s and 70s (late Showa) Japan, who basically had their childhoods literally weaponized not just against them, but the world as a whole, and who ultimately had to go into conflict with their childhoods to save the world and themselves. 21st Century Boys serves as an epilogue to answer one last lingering question – why?
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