Joining forces with Ryousuke and Keisuke Takahashi, Takumi Fujiwara embarks on the creation of 'Project D.' Their mission encompasses Ryousuke's pursuit of perfecting his 'High-Speed Street Racing Theory,' and Keisuke and Takumi's quest to elevate their driving prowess by engaging formidable adversaries on treacherous paths. Project D sets out to challenge rival street racing factions from various regions to enhance their uphill and downhill racing credentials. To lure top-tier competition, Ryousuke establishes a dedicated online platform to publicize Project D's upcoming clashes and track their performance. The fourth installment of Initial D delves into the triumphs and tribulations faced by Project D's members as they strive to establish themselves as the premier street racing crew beyond Gunma Prefecture.