Showa 66, Japan has bought out most of the United States with its strong economic power. A surge of immigration has firmly planted Japanese culture within the American continent. The United States, once a world leader, has become an unofficial colony of Japanese economics and culture, and the two cultures are rapidly amalgamated. Although conflicts are inevitable, citizens are gradually adapting to a life never imagined as time goes by. However, a mysterious catastrophic incident changes the world drastically.
19-year-old action movie stuntwoman Choko and her sister have come to Hollywood, now named New Yokohama, to audition for a part in a new film. Assassinated on arrival by mysterious agents, Choko's body is buried in the wilderness on the outskirts of New Yokohama, and her sister is nowhere to be found. An unknown amount of time passes, and air fills Choko's lungs once more as she rises from the soil. By some miracle, she's still alive, but something about this world is very wrong. Zombies roam the streets, monsters and a few remaining humans compete for scarce resources. Criminal underworlds are at war with each other while a mysterious organization fights back to rebuild social order. Recovering a vehicle from a movie studio ruins, Choko embarks on a journey across the United States to find her sister. But what lays in wait for her on the way? What has unfolded during Choko's slumber?