After securing a string of hard-fought wins in the Tochigi, Saitama, and Ibaraki prefectures, the drivers of Project D—an amateur street racing crew headed by former street racer and master strategist Ryousuke Takahashi—Takumi Fujiwara and Keisuke Takahashi must now elevate Project D to the next tier: the Kanagawa prefecture, widely regarded as the holy land of street racing. Their adversaries, hailing from Kanagawa’s three top street racing teams, devise a complex plan dubbed the "Four Lines of Defense" to decisively crush Project D’s ambitions. Meanwhile, Takumi senses he must hone his driving abilities to make up for the narrow victory he barely scraped against Toshiya Joushima. The moment of truth has arrived for Project D, bearing the hopes of Gunma Prefecture; will they succeed in countering the unexpected tactics of Kanagawa’s skilled street racers?