In the world of motorcross racing, the smallest error can carry a terrible cost: an arm, a leg, even a life. The danger has always been part of the attraction for the young Toppu Uno, but now there's something else drawing his eye: the lovely and nimble female rider Mao. To ride with her, the smitten Toppu will suffer through an endurance race that will bake his bike and body for hours in the harsh sun. His salvation will come from an unexpected place: his rival, Takadai!