二体の巨大バトルロボットが廃墟と化した地球で激突する

Planet Earth, year 2199, after the Third World War, during a nuclear apocalypse when the sun is hidden behind a thick radioactive cloud, there are two colossal robots that collide with all their futuristic weapons, they are seriously damaged but continue to fight, one is Gundam and the other is Mazinger Z.