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.