"20th Century Boys" is a manga series that follows the journey of Kenji Endo and his childhood friends as they confront a cult-like figure known as "Friend" and try to save the world. The series is known for its intricate plot, well-developed characters, and references to classic manga and anime from the 1960s–1970s. It has received critical acclaim and is one of the best-selling manga series of all time. added by @strikee