Set after the events of Kaido Battle/Tokyo Xtreme Racer Drift, Tokyo Xtreme Racer Zero, and Tokyo Xtreme Racer 3 — but before Kaido Battle: Touge No Densetsu. In the year 20XX, Japan's mountain passes have been transformed into high-tech racing circuits, equipped with safety systems and embraced by the street racing community as the ultimate venue for car battles. Koukami, who defeated the former Emotional King Hamagaki, now holds the title. New circuits have opened — Akagi, Zao — and new challengers have arrived. Some familiar Slashers have returned, including MMC Ooaza and Haruna Guardian; others, like Lonely Wanderer, have moved on; and fresh names have taken their places.