Speedo is a planet deep in a distant universe, where speed is the one and only master. After 5,000 years of development, the planet of Speedo has achieved remarkable technology. Five tribes, led by the Mali Tribe, rule the entire continent and have long lived in peace. Then, 4,500 years ago, the Aemon Tribe suddenly launched a massive invasion of the other tribes, disrupting a balance that had lasted for tens of thousands of years. The Viking and Landi Tribes fell one after the other, barely able to resist. At the crucial moment, the Mali Tribe was betrayed by its neighboring Inca Tribe and suffered a crushing blow, from which it never recovered.
