After the riot at the Shibuya crossing was reported, four people, Ken aka Gatchaman, Takeshi aka Polymer, Joji aka Tekkaman, and Tetsuya aka Casshern, were hiding in Lol's house. They gathered in this world unwillingly, but it was a peaceful night after a long time for those who have led a unique life of fighting days and endless journeys. Joji, who has traveled through various parallel worlds across time and space, talks about the existence of World Destroyer Z.