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The year is 1945. The Americans attack an uncharted Japanese island that holds a secret scientific base where scientists are working on a new kind of weapon - a giant robot known simply as The Ironman. Jump to the near future. A new criminal organization has threatened the governments of the world with an army of mechanical weapons and beasts. The freedom of the world rests on the collective shoulders of an establishment called the International Justice Organization. To meet this threat, in one of the IJO's secret labs, a new weapon for justice is being created, a weapon code-named : GIGANTOR. But the project is far from completion, and the lab has been infiltrated by a traitor !