Humanity, having faced extinction at the end of the 20th century, would not have entered the new millennium if it weren't for them. In 1969, during their youth, they created a symbol. In 1997, as the coming disaster slowly starts to unfold, that symbol returns. This is the story of a group of boys who try to save the world.

Out in the middle of Tokyo Bay, a man called Shogun is trying to break out of Umihotaru Prison, a maximum-security island fortress, so he can save the world. Accompanied by a frightened young manga artist, these two men are prepared to risk everything as their daring escape plan grows deadlier by the minute. However, the prison authorities will do whatever it takes to return Shogun and his reluctant companion to custody.

Shogun's ultimate goal: Tokyo, where a girl he calls the final hope lives, but a murder in Kabuki-cho has triggered a chain reaction of terror. Can Shogun reveal the truth about the false peace created by the Friends? And what are the facts behind the disaster that took place in the final moments of the 20th century?!