In the conclusive race against the Kanagawa street racing crew Sidewinder, Takumi Fujiwara of Project D is met with an unforeseen rival, a 17-year-old high school student named Shinji Inui. Shinji, a seasoned driver who has been behind the wheel since a young age, is not only familiar with the mountainous pass where the race is held but also owns the same Toyota AE86 model as Takumi. Initially disinterested in participating, Shinji's motivation is ignited upon witnessing the heated face-off between Keisuke Takahashi and Gou Houjou. With an undefeated record on his home circuit, the Tsubaki Line, Shinji possesses the potential to be Takumi's most formidable adversary to date.