It's 1951. The Pacific Theater of World War II ended six years ago, but the fighting never stopped. Pirates, warlords, and mercenaries jockey for the arms, ammo, and airframes left by the Japanese and American Navies.
And in the middle of it the rogue Japanese military unit CHOKAITEN emerges from the shadows of history. They are on the verge of accomplishing their top secret mission to unleash a devastating super weapon that will sink the North American continent.
Only ATOMIC ROBO and the FLYING SHE-DEVILS stand in their way!