21st Century Boys

As the conflict between Kenji Endo, his childhood friends, and cult leader "Friend" comes to an end, two mysteries remain—Friend's true identity and whether the threat of an "anti-photon bomb" before his death was legitimate. Hoping to find an answer, Kenji, alongside the United Nations, decides to use a virtual reality program created from Friend's childhood memories in this conclusion to a long journey that will span decades.

20th Century Boys and 21st Century Boys' combined storyline won the Grand Prize at the 37th Japan Cartoonist Awards on May 9, 2008.

VIZ Media published the manga in English under the VIZ Signature imprint from January 15, 2013, to March 19, 2013, and later as a 2-in-1 omnibus volume. It was also released in Brazilian Portuguese by Planet Manga; in French by Panini Comics; in German by Planet Manga; and in Spanish by Planeta DeAgostini.

A complete edition of 21st Century Boys was released on December 28, 2016, in Japan by Shogakukan. It features the entire series in colored pages and a new ending unique to the publication. VIZ Media published the version under the title 21st Century Boys: The Perfect Edition on June 15, 2021.