Kamen Rider Gotchard VS Kamen Rider Legend

“Reiwa Rider? 100 Years Too Early!”

Houtaro is suddenly transported to a parallel world. Awaiting him is a young man named Houou Kaguya Quartz who summoned him using that world's technology, the Aurora Curtain System. His favorite phrase is "Gorgeous" and he protects the world from the clutches of the evil organization called "Hundred". What's more, the person following Kaguya is a butler named Butler, who looks exactly like Houtaro's friend Ryo Kajiki!