20th Century Boys is a Japanese manga series written and illustrated by Naoki Urasawa. It was originally serialized in Big Comic Spirits from 1999 to 2006, with the 249 chapters published into 22 tankōbon volumes by Shogakukan. In January 2007, a sixteen chapter continuation titled 21st Century Boys ran until July, and was gathered into two tankōbon. It tells the story of Kenji Endō and his friends, who notice a cult-leader known only as "Friend" is out to destroy the world, and it has something to do with their childhood memories. The series makes many references to a number of manga and anime from the 1960s–1970s, as well as to classic rock music, its title being taken from T. Rex's song "20th Century Boy".
