Nene Shida

Has the world suddenly split into four? Keiwa Sakurai, Neon Kurama, Michinaga Azuma, and Tsumuri are flung into different worlds. And for some reason, a different Ace exists in each of the four worlds. The cause seems to be from the "World Doomsday Game" started by the staff from the future. In light of this crisis, the mysterious Cross Geats appears. Just what will happen to Ace and his friends?

A sinister Ace transforms into Kamen Rider Dooms Geats, clashing with allies. Beroba, another Ace, awakens Michinaga's might. The Riders unravel the enigma surrounding the two Aces to thwart the God of Destruction's advent.

Keiwa and Sara are transported to the World of Shinobi where they assist Rentaro and his allies in fighting the powerful Amakusa Shiro Tokisada.