In the 21st century planet Earth was rendered inhospitable to life, and people mass-migrated to Planet Zi, the natural home of metallic life forms known as Zoids. Many years later, Zi faces its end.

All Class A teams are put into the Royal Cup competition. The winner gets admitted into Class S, but the only Zoids that can be used are what you carry on hand. There can be no repairs once a Zoid is ...