Rin Shiguma is the central character, his name incorporating a pun on "four-wheel drive" that reflects the racing theme. This young boy captures the championship in mini four-wheel drive racing, operating his favored electric model car, Soldier. He claims victory in the Grand Prix against his primary rival, Waka, breaking the existing record for consecutive wins in the process.

Following this triumph, a group of mysterious racers hired by Waka confronts him. Among them stands Mr. Mecharic, a skilled mechanic and magician, who steps forward as the first challenger. Rin accepts this duel, unaware of what tactics or surprises Mr. Mecharic has prepared.

Rin demonstrates determination and confidence in his racing abilities. His interactions highlight his role as a skilled competitor facing external challenges driven by his rival's resentment and resources. His participation in this significant challenge is a key event.