Sho is a straight-arrow elementary schoolboy with a passion for mountain-bike racing and a determination never to be second. One day, Sho accepts a rival team’s challenge and enters a special race. During the race, Sho and his friends are swallowed by a dark mist and then suddenly find themselves in a different space known as the X-Zone. The only way to return home is to collect ten “emblems,” prizes awarded to winners of the race! Riding “Flame Kaiser,” the bike his father left to him, Sho enters the extreme bike race called the “IDATEN Battle”!