right from the video's page:
'About the drift matsuri:
November 13 and 14, another crazy drift matsuri took place at Ebisu Circuit in Japan. This drifting event is one-of-kind, pretty much anything is allowed, just use your head a little.
People buy special "drift missiles" (very cheap drift cars) not having to worry about damaging it. This makes this drift event so special and allows people to really go to the limit and a lot of times over the limit. This is the ultimate way to learn drifting."