After disasters have all but destroyed the Earth, leaving entire cities buried, one man named Violence Jack tries to avert a civil war brewing among the wretched inhabitants of a subterranean metropolis called Evil Town. The known world is now a nightmare after a series of natural disasters. Survivors struggle to survive the harsh conditions. Evil Town is divided into three warring factions each fighting for supremacy.

When the school Karate club's star fighter quits and decides to go pro, he unwittingly fulfills an ancient interdimensional prophecy and becomes demon king of his dimension. Soon his high school becomes a battleground for demon slaying samurai, interplanetary law enforcement, and even his own traitorous demon minions. Well animated fight scenes ensue.

The Dezalg have returned with a new, horrible weapon and unleashed it on Megazone 23's defenses. Believing their salvation is also in new weapons, B.D. is again bent on breaking the EVE's final protection level.Full control of Megazone 23 would mean unfettered weapons development. Shogo, meanwhile, has tried to return to a 'normal' life; Hanging out with his biker gang, "Trash" and his girlfriend, Yui. But, his convictions about the Megazone's shadow government policies haven't changed and when EVE calls for his help, he discovers where the Garland bike has been hidden. It's showdown time for Shogo and B.D., Trash and the military, as well as the Dezalg and Megazone. However, EVE's final secret, A.D.A.M., may mean no one will survive.

A young biker stumbles onto a prototype motorcycle with a hidden function that has a link to the true nature of his world.