Years into the future after Earth has been overly polluted and resources are running low, a scientist quickly comes up with a solution: a new chemical that will reverse the effects of pollution. As colonists settle in space to avoid the pollution, the newfound chemical is quickly launched in a missile into the atmosphere where it explodes and releases the chemical.
However, the chemical begins to horribly mutate any and all humans infected with it. The scientist knew the effects of his chemical and uses the mutated people as his soldiers to rule the Earth. After choosing either the male character, Allen, or the female character, Sheena, the player is sent to five different levels around a fantastical Earth.
Sheena has an ice affinity, while Allen has a lightning one. A third Saber, Kurtz, is aligned with fire, and is an enemy the player must fight several times. The players can use a slash attack (the standard attack) which Allen does forward and Sheena upward, use a mid-air kick, or use the Hyper Bomb (special pick up item). The players can also climb up and down walls and hang onto the ceiling. There is a power jump similar to the Screw Attack of Super Metroid.
In each of the five levels (Taj Base, Tong City, Jodvalley, Grey Fac, and Bruford), there are multiple minor bosses and one final boss at the end of each level. These battles are noted when an alert message appears on the screen. In between each boss, the player must fight hordes of enemies and collect health pickups and weapon enhancers.