The group gets their name from their preferred route known as the Kanjo. It's a 4.77-mile long loop of connected highways running right through the city of Osaka. You might expect a hardcore group of illegal Japanese racers to show up with highly tuned Nissan GT-R and Toyota Supra coupes, but the Kanjozoku evidently eschew all of the others in favor of one particular car that they love: the Honda Civic.
According to the video, that vehicle of choice came in part from the city's location. Osaka was relatively near the one-make Civic races held at Japan's legendary Suzuka racetrack. The hatchbacks thus became the default weapons for the Kanjozoku's street battles.
The guys interviewed for the documentary go so far as to claim that their scene created the whole concept of JDM tuning. The whole video is a really interesting portrait of an illegal racing scene crafted out of friendly competition. Scroll down for a brief look at the Kanjozoku of Osaka – it's worth it.