A band of monsters are locating a chest containing the Rider Rings, only for them to be stolen by two children. Meanwhile on his new journey after Gremlin's destruction, Haruto hears the cries of children from a giant Magic Stone and is sucked in. He soon awakes and finds himself in an alternate world where all of the various monsters ever defeated by Kamen Riders end up in. He manages to run into the children as well as the elder versions of the Doughnut Shop Hungry's Manager and Worker and younger versions of Rinko and Shunpei.