Comic book series : 20th Century Boys

In the middle of the Tokyo Bay, a man known as Shogun has escaped from Umihotaru Prison, a place feared by criminals and convicts as an inescapable iron fort, in order to save the world. He heads off to Tokyo, the city where the girl known as "The Last Hope" lives. But the streets of Tokyo are in turmoil after a murder in Chinatown triggers a chain reaction of terror. The time has come for the false peace created by the Friend to be exposed. What is the truth behind the historic disaster on the last day of 20th century?