Unaired OVA bundled with limited edition eighth volume of the manga. The episode centers around the actions of Inari and Kon.

Takumi Fujiwara finally joins Ryousuke and Keisuke Takahashi to create Project D. Their goal is twofold: Ryousuke wants to develop his High-Speed Street Racing Theory, while Keisuke and Takumi aim at improving their driving skills by facing powerful opponents on dangerous roads. The idea of Project D is to challenge street racing teams from other prefectures to improve both their uphill and downhill records. In order to attract the attention of the best racing teams, Ryousuke creates a dedicated website to announce the future battles of Project D and post the team's results. The fourth season of Initial D details the hardships and successes of the members of Project D as they try to become the best street racing team outside of Gunma Prefecture.

There are many street races in the Initial D Series. This OVA has no plot other than to collect all the street races into one stage. The dialog during the original races is left in.

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?