This is simply the OAV summing up the major events and battles of "Initial D 4th Stage" much like the "Initial D Battle Stage" original summed up the first 3 seasons. Additionally, has 2 extra battles from the manga that were not incorporated into the original 4th Stage.
 
(Source: Anime News Network)

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

Takumi Fujiwara and brothers Keisuke and Ryousuke Takahashi have formed "Project D," a racing team aimed at bringing their driving skills to their full potential outside their prefecture. Using the internet, Project D issues challenges to other racing teams and posts results of their races. Managed by Ryousuke, the team has Takumi engaging in downhill battles with his AE86, while Keisuke challenges opponents uphill. Among their rivals are the Seven-Star Leaf (SSR) and Todo-juku.

Only the fearless survive in the white-hot world of street racing, as teams take on dangerous roads in the shadow of Mt. Akina. Behind the wheel of the mysterious "Ghost of Akina" is Takumi, on his way to becoming the greatest racer ever. (Source: Tokyopop)
 
Note: the chapter count includes 6 extra chapters published in volumes 2, 3, 30, 33, 39 and 48.

The third compilation OVA of Initial D. This time it features every race from Fifth Stage and Final Stage. Although it follows the same format as the two previous Battle Stages, this OVA doesn't include any conversation nor any new races. 

Tags