Sho Yamato and his fifth-grade friends Kakeru and Makoto are fans of mountain biking. Riding the "Flame Kaiser" bicycle built by his father, Sho and his friends practice in their haunt called the 'X-Zone'. As another team of mountain bikers known as "Shark Tooth" challenge them to a race, Sho's team is transported into an alternate world, also called...

Sho Yamato and his fifth-grade friends Kakeru and Makoto are fans of mountain biking. Riding the "Flame Kaiser" bicycle built by his father, Sho and his friends practice in their haunt called the 'X-Zone'. As another team of mountain bikers known as "Shark Tooth" challenge them to a race, Sho's team is transported into an alternate world, also called 'X-Zone' where they will face 'Idaten Battles' by racing through volcanoes, ghost towns and deserts to return to their own world…