A man's mundane present is shattered by the resurgence of a childhood cult and the violent deaths of his friends, forcing him to confront a past he barely remembers. Kenji, a convenience store manager, is drawn back into a dark conspiracy when a friend's suicide is linked to a mysterious cult. He must reunite his old gang to uncover the truth behind the cult's rise and its connection to a series of murders and disappearances, all while navigating the shadowy machinations of a figure known only as 'Friend'. The narrative unfolds through Kenji's perspective, interweaving present-day investigations with flashbacks to his youth.

The initial volume of Naoki Urasawa's '20th Century Boys' is lauded for its intricate plotting and compelling mystery, drawing readers into a complex narrative that spans decades. Critics often highlight the masterful way the story balances suspense with character development, creating a palpable sense of unease and intrigue. The series is recognized for its ambitious scope, weaving together elements of science fiction, thriller, and a poignant exploration of nostalgia and lost innocence. Readers frequently praise Urasawa's distinctive art style and his ability to craft a story that is both deeply personal and grand in scale.