21世紀少年 [Nijūisseiki Shōnen / 21st Century Boys]

In 2007, Shogakukan launched 21st Century Boys, a two-issue sequel series by Naoki Urasawa that directly continues the paranoid, sprawling narrative of his acclaimed 20th Century Boys. Picking up after the original saga's climax, these final chapters resolve lingering mysteries and explore the legacy of the "Friend" conspiracy. Though brief, the series is essential for completing Urasawa's epic examination of childhood promises, adult responsibility, and the battle against a hidden world-threatening cult. It stands as a concise, powerful coda to one of manga's most ambitious thrillers.