Kenich Hibiki, a talented racing driver and engineer, constructed the Mach, a vehicle powered by the revolutionary Engine X. Tragedy struck during a test drive when Kenich was killed, but his father, Daisuke, salvaged the wreckage as a keepsake. Years later, Daisuke rebuilt the car into the new Mach for Grand Prix competition. To ensure the driver's safety, it features the Safety Seven system with seven protective devices, while retaining the miraculous Engine X. The pilot is now Go, Kenich's younger brother, who is driven by his sibling's legacy. Go enters the Grand Prix, steadily rising to become a world-class racer.