A world 100 years in the future where no one drives cars-instead, computer-controlled, electrically powered "AI cars" automatically take you where you want to go. However, when the AI cars mysteriously start to run amok, an organization called eX-Driver is established to figure out why. Although no one in this world knows how to drive, there are some people who seem to have an instinctive ability to drive old-fashioned, gasoline-powered cars, thus earning an eX license. Two friends-Risa, a straightforward and cheerful girl, and Rona, a calm and easygoing type-are on the road toward becoming eX drivers.