20th Century Boys 2 by Naoki Urasawa

When a sinister movement built around a symbol from a group of childhood games begins enacting real-world attacks, a former convenience-store owner and his old friends are drawn into a dangerous investigation; flashbacks to their youth gradually reveal how an innocent fantasy and a homemade “prophecy” were twisted into the blueprint for a growing cult, and as threats to loved ones escalate they must reconnect, uncover hidden betrayals, and decide how far they will go to stop a conspiracy that threatens the city and themselves.

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