Rin Shiguma, a young boy, is a champion in the sport of mini four-wheel drive (Mini 4WD) racing with his favorite electric model car, Soldier. He wins the Grand Prix race against his rival, Waka, and breaks his record for consecutive wins. However, afterwards, a group of mysterious racers hired by Waka appear before Rin. One of them, Mr. Mecharic, who is both a skilled mechanic and a magician, comes forward as the first one to battle Rin. Rin accepts the challenge, but little does he know what Mr. Mecharic has in store...