Jimmy was an ordinary boy who enjoyed playing computer games. One day, while playing a game titled 'Track City', he was suddenly transported into the game world! After regaining consciousness, a woman who appears to be the mayor of the city explains to him that the world is threatened by a powerful malignant virus, and her allies' only hope is to seek the help of the "Legendary racer", the best player of 'Track City'. Things become complicated when Jimmy discovers that the game made a mistake and confused him with the Legendary racer! Will Jimmy acquire the necessary skills to defeat the viruses that threaten the world? Or will he be erased by the 'big head', the heavenly punisher that annihilates those who cannot achieve victory?