The story takes place in a alternate postwar period, in 1996, where Japan is divided. Hokkaido is ruled by the "Union" while Honshu and other southern islands are under US authority. A tall tower was built on Hokkaido, which could even be seen from Tokyo. In the summer of 1996, three middle-school students make a promise that they'll cross the border with a self-constructed plane and unravel the tower's secret, but their project was abandoned after the girl, Sayuri Sawatari, became mysteriously ill and transferred to Tokyo. Years later on the brink of another war Hiroki Fujisawa finds out that Sayuri had been in coma since then, and he asks Takuya Shirakawa to help him finding a way to wake her up.

While working in a cinema, Gintoki comes upon a "movie thief" (a figure in Japanese culture often depicted as a man with a video camera as a head, stand in as someone who illegally film in cinemas). After scolding the movie thief for his actions, he finds himself warped into another world via the camera lens. In this world, 5 years have passed, and not only has the land of Edo changed into an apocalyptic wasteland, but it is stated Gintoki has passed away. The movie thief, or Time Thief the time machine, explains mankind is close to extinction, and gives Gintoki an item to disguise himself. After the Time Thief is damaged by criminals, Gintoki encounters his freelancer comrades: Shinpachi Shimura, who has turned into a cool samurai with no trace of tsukkomi, and Kagura, who has changed into a beautiful woman with no Chinese speech pattern. The future's Gintoki is assumed to have died as a result of the "White Curse." Kagura and Shinpachi have been trying to deal with their leader's ... Written by Anonymous