After defeating every racing team in the prefecture, everything comes down to one last race. Takumi Fujiwara has never lost a race, but when his opponent is also using an AE86, it turns into a battle of the AE86. Will Project D succeed in the final and most difficult race of Initial D?

Tomoe Shiro, a formidable racer with a very promising career, experiments a U-turn when a serious accident puts his life at stake. He recovers miraculously though when his heart is replaced with the engine of his own racing car. However, because of that very reason, race regulations demote him to the category of a mere mechanical part of the vehicle and is deprived from the right to participate as a pilot in regular races. Only in a far away colonial planet, along with a multitude of other charismatic pilots also vetoed from participating in regular competitions, will he be given the opportunity to race for his pride and the money of the prize. And so this exciting rally starts!! (Source: Official website)

After losing his mother at a very young age, elementary school student Capeta Taira is forced to become more independent to avoid his father worrying for him. Working in a paving company, his father is often busy and has to work overtime to make ends meet. However, no matter how tough he acts in front of his father, Capeta is ultimately just a lonely kid with a rough life. In addition to his typical house duties, he has to deal with the bully Nobu Andou which makes him feel worse, despite support from his classmate, Monami Suzuki. One day, Capeta's father sees young go-kart drivers racing at high speeds and gets inspired by the scene. He then decides to collect scrapped parts available on the track and begins working on a gift for his son. Meanwhile, Capeta and Monami sneak into his workplace, suspecting that his father is up to something. Much to their surprise, they see a go-kart built from discarded parts—with Capeta's name attached to it! Although it lacks an engine and looks worn out, the kart is mostly complete and functional. Despite the heavy rain, Capeta cannot resist the urge to try out this new machinery. As he drives the kart downhill on a wet road, an incident that is almost a dangerous accident instead becomes a thrilling obsession. No longer bored with life, the engine of Capeta's heart is ignited with a new passion as he journeys into the world of racing. [Written by MAL Rewrite]

After earning a series of difficult victories in the prefectures of Tochigi, Saitama, and Ibaraki, the drivers of Project D—an amateur street driving group led by ex-street driver and expert tactician Ryousuke Takahashi—Takumi Fujiwara and Keisuke Takahashi now have to take Project D to the next level: the Kanagawa prefecture, commonly known as the holy land of street racing. Their opponents, members of the three best street racing teams of Kanagawa, design an elaborate strategy called the "Four Lines of Defense" to put a definitive end to the ambitions of Project D. Meanwhile, Takumi feels he needs to refine his driving skills to overcome the last victory against Toshiya Joushima that he only just managed to snatch. The moment of truth has now come for Project D, which carries with it the hopes of the Gunma Prefecture; will they manage to thwart the surprising tactics of the skilled street racers of Kanagawa? [Written by MAL Rewrite]