The Mach is a racing car equipped with a new engine "X", which was specially developed and built by Kenich Hibiki, a man who was both a racing driver and a motor engineer. However, during a test drive conducted before the car's completion, he was involved in an accident and was declared dead. Meanwhile, his father Daisuke, who had watched the test drive from start to finish, recovered the wrecked car as a memento of his son. A few years later, the damaged car, rebuilt by him, is revived as the new Mach, which enters the Grand Prix. This time, however, to protect the driver from potential accidents, the new car is fitted with a safety system called "Safety Seven", featuring seven guarding devices. It also carries the engine "X", which miraculously survived the tragic accident. The current driver is Go, Kenichi's younger brother, who is determined to carry on his brother's will. In fact, he successfully competes in the Grand Prix and continues to grow into a top racer in the world.