Twenty years after their planet was attacked by the brutal Zone Empire, the five Hoshikawa children, who escaped and were raised on Earth, must prepare for a brand-new war. This time, though, they're ready ... having developed the powerful Fiveman technology that will help them defend Earth from the same empire that conquered their home world.

Special Investigation Robo Janperson was the 1993 installment in Toei Company’s Metal Hero Series. The series revolved around Janperson, a robotic detective who patrolled the streets of Tokyo and fought against three different underworld organizations who used super technology to subjugate the masses. Unlike most Metal Heroes, a monster-of-the-week was rarely shown and most of the villains are criminals akin to television police dramas. The name given to this series by Toei for international distribution is Jumperson.

Takahiro Yamane is the owner of an automobile tuning shop. His friend, Junichi Tashiro, has a girlfriend Nozomi who's a reporter and has connections to the race driver Keiichi Tsuchiya. Tashiro accepts a challenge from another street racer named Sawaki, and dies in the attempt. Nozomi shows Takahiro the Skyline GT-R that she bought for her late boyfriend. She gifts this car to him. Takahiro, while discouraged by her not to drive the Shutoko again, Sawaki challenges him to a duel.

A boy named Kenichi, has been diagnosed with terminal cancer. His most favorite car is the Skyline GT-R (BNR32). His only wish, was to become a professional driver, like his idol Keiichi Tsuchiya. His older brother sells not only his car (Silvia K's (S13)), but also his father's car as well, in order to buy a Red GT-R (BNR32). The elder brother chose to race on the streets because he knows his Kenichi won't be able to see it by the time he went pro. One day while visiting the tracks, the little boy happened to bump into Tsuchiya and was taken for a ride. As the younger brother's condition becomes worse, and on his deathbed, he makes his older brother promise to become a professional driver, and to beat Tsuchiya in a race.

Former Megalopolis Express Freeway record holder Kyosuke has retired from street racing and now belongs to a pro racing team. One day while performing time trials, a Toyota Supra comes onto the track and challenges Kyosuke to a race, but he is no match for the former street racing record holder. Kyosuke is still haunted by that devastating crash that occurred on the Expressway a few years ago, which caused him to leave street racing. When Kyosuke hears his old rival, Yusuke has crashed on the freeway while racing the unknown Supra, Kyosuke returns to the Megalopolis Express Freeway for one last street race.