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.
Nothing gets the blood pumping like a high-intensity race, be it in a car, bike, or even mecha suit. Youthful passion and energy fuel these shows about drivers, pilots and athletes all striving for that #1 spot. As Ricky Bobby once famously said, "If you ain't first, you're last".