Ran (Shimamura) comes to Japan, and makes an immediate impression by assassinating a Yakuza boss and his associates, while they dine in a restaurant.

1997年，超级电脑炼金之星预测到地球将会破坏招来体所消灭。得知此事后人类用炼金之星的研究技术组成一个全球防御组织GUARD，而XIG则是GUARD的战斗力量。