Tokyo is the capital and largest city in Japan.
It is the setting for the multiplayer map Precinct, featured exclusively in Call of Duty: Infinite Warfare. In the map, Tokyo has suffered a full-scale invasion perpetrated by the SDF.
It also appears in the Call of Duty: Mobile comics, where The Five Knights member Hidora Kai is hiding out.
Tokyo makes an appearance in Call of Duty: Vanguard where it's featured in the multiplayer map, Mayhem.
Tokyo appears in Call of Duty: Modern Warfare III as the map of the same name, Tokyo.