The World of Kamen Rider (仮面ライダーの世界 Kamen Raidā no Sekai) is, according to the Shuriken Sentai Ninninger Vs. Kamen Rider Drive Spring Vacation Combining Special, the home dimension of the Kamen Riders, parallel to that of the Super Sentai. The Ninningers are brought there through the actions of the History Modifying MachineImage:Icon-crosswiki.png created by ShockerImage:Icon-crosswiki.png, with Kyuemon Izayoi working in a temporary alliance with Shocker and the RoidmudesImage:Icon-crosswiki.png. The Ninningers return to their world after destroying "Doctor DImage:Icon-crosswiki.png" (Roidmude 089Image:Icon-crosswiki.png) with Kamen Riders DriveImage:Icon-crosswiki.png and MachImage:Icon-crosswiki.png. In Super Hero Taisen GP: Kamen Rider 3Image:Icon-crosswiki.png, the Ninningers return to