Kappeita Taira (平 勝平太 Taira Kappeita^?), otherwise known as "Capeta" (カペタ Kapeta^?), is a ten-year-old boy whose single-parent father, Shigei Taira (平 茂雄 Taira Shigei^?), works for a paving company. While completing a paving job at a go-kart track, his father sees a young boy racing at the track and is amazed at the speed and seeming thrill of the sport. Realizing that his young son has an interest in racing cars (particularly Formula One), Shigei asks the circuit steward as to whether he is able to take some old worn-down parts out of the circuit's trash pile. Taking these back to his workplace, he manages to construct a rundown yet drivable kart. Shigei's boss, Mr. Ikari, (initially begrudgingly) supplies a 4-stroke generator engine to power the kart.

Determined, Capeta, in his first time on a race track, manages to not only master the mangled racer, but also catches and attempts to overtake Naomi Minamoto (源 奈臣 Minamoto Naomi^?) on the inside line, a talented young racer who drives for a works karting team, Endless Autohouse Racing. This overtaking maneuver shocks Naomi so much so that he drops the accelerator of his kart, accelerates past Capeta. This infuriates his mother and team manager, Nanako Minamoto (源 奈々子 Minamoto Nanako^?), as he over-revved a brand new engine which he was supposed to be merely running in. Nobu Andou and Monami Suzuki, Capeta's best friends, support him in his karting - Nobu as his technical assistant/manager and Monami as the self-appointed team manager.

Capeta, unaware of the difference in machinery between his own kart and Naomi's works-grade kart, does not understand why it was impossible for him to catch Naomi. Nonetheless, onlookers are amazed that a child from out of the blue is able to push his machine to such a limit, let alone unnerve the track's local hotshot. Nanako, also amazed, offers to help Capeta's entry into the world of kart racing, secretly as a rival for her son. After what is a difficult conversation for Capeta, the Taira father and son turn down the offer to enroll Capeta in the Endless Autohouse Racing team and run their own single kart team on their own instead.

In the second arc, Capeta has grown up. He is now 14 years old, in 3rd grade of junior high school and has won the junior karting class he had competed in. His racing suit and kart are now blue, his racing number having changed from 14 to 30. Nobu and Monami have also matured a lot while still helping Capeta with his karting aspirations. Having stepped up to a more senior class (ICA Class), he realizes that to win races is a lot harder without the support of a well-funded team. In what he sees as his final chance - a race in torrential downpour - he pushes himself to the limit so as to give himself the best chance of winning, but is relegated to second by the smallest of margins and fractures his ribcage in the process. After he is hospitalized, he is introduced to a one-make automobile racing formula known as Formula Stella (an indirect reference to Formula Toyota). As he was exceptionally talented in kart racing, Nobu presents Capeta as a candidate to attend FSRS, the Formula Stella Racing School. After proving to the head of Stella's racing arm that Capeta was worthy, Nobu is given the enrollment paperwork. One condition stressed by the Stella management is that crashing is absolutely prohibited - not simply for the loss of money incurred, but also the loss of confidence in that racer to produce results under racing conditions.

Although not having so much as the ability to change gears in a regular car at the start, Capeta quickly progresses to be one of the fastest students in the school. During the qualifying for the mock race on the last day though, Capeta crashes due to not being able to avoid a slower racer who had lost control of his car and spun on the track. Capeta was taking a blind uphill figure-S corner, so he couldn't see ahead. By the time Capeta's instructor, Shinkawa Hideki, told him to watch out, Capeta locks up his car's brakes and the two machines crash. No one was hurt in the incident, but Capeta was devastated due to breaking his promise of not crashing and feels that his future in racing is over. His father, though, does not give up and encourages Capeta to continue - despite the ¥1,500,000 damage costs from Capeta's accident.

He uses his talents, going on to win his races, defeating his team's talented racers AND making him a series winner even though the last minute, his engine breaks, but still, he wins the race, with Shiba Ryou close by. Nobu admits that he wants to become the best racing-manager. And that he'd always be with Capeta till the very end. The last episode ends with an outlook at the near future: it is narrated that Naomi and Capeta race against one another in the Italian Grand Prix at Monza. The last narration was: "Both racers are very talented. It's a fight between two Japanese".