In 1999 a mysterious object crashes into the desert and a mysterious creature, Darc Seed appears. Using his mental and magnetic powers, he soon turns the people of the United States into zombies and exerts influence over various weapons and objects. Among the weapons Darc Seed claims is the legendary samurai sword, Shura. When the great head of the samurai, Namakubi he sets out for the United States to defeat Darc Seed and reclaim the sword.
The game is a side-scrolling shooter in which the player can control Namakubi's movement across the screen and the ability to shoot. Enemies reduce health by varying amounts, health can be restored by eating people. All in all, Namakubi will trek it out across four distinct stages; New York, Grand Canyon, an oil refinery in Texas and a huge cavern.