Zenkoku Dekotora Matsuri is a Truck Racing game, developed by Suzak and published by Jaleco Entertainment, which was released in Japan in 2008.
This game is quite hard to find digitally, however a few copies are available online for purchase still.
Zenkoku Dekotora Matsuri was also featured on the Dolphin Emulator YouTube channel, where the game has received much more attention since.
Dekotora or decotora (デコトラ, dekotora), an abbreviation for "decoration truck", are extravagantly decorated trucks in Japan. Commonly displaying neon or ultraviolet lights, extravagant paints, and stainless or golden parts (both on the exterior and the interior), dekotora may be created by workers out of their work trucks for fun, or they may be designed by hobbyists for special events. They are sometimes also referred to as art trucks (アートトラック), ātotorakku)).