World War II is over, decisively ended when the Empire of Japan unleashes their new superweapon on t sthe United States of America. Soon they are declared the United States of Japan, under the rule of the Emperor.
The story begins from the point of view of people held in an internment camp for Japanese-American citizens, who are immediately released upon the Japanese seizing control. 40 years later, the child of one of those, Beniko Ishimura, is working as a video game censor as the subversive video game United States of America starts gaining popularity. United States of America is an alternate history war game where the United States won World War II. Meanwhile, Akiko Tsukino of one of the secret police forces, is out to investigate the game herself. They cross paths and begin to uncover deeper secrets about the game and about the United States of Japan.