The Underground Empire Badan makes its move, intending to invert the world. Kouta and Mai are pulled through one of these inversions where the discover a boy named Shu, who also holds the power to invert the world. As the Riders fight to protect Shu, Fifteen appears again, seeking Shu. As Kouta flees, past Riders gather and fight one another, split between the Showa and Heisei era Riders. But, the truth of Badan is not as it seems…

"Heisei VS Showa. The Rider confrontation that breaks all rules will be settled."

Credits

Takayuki ShibasakiDirector

Gaku SanoKouta Kazuraba / Kamen Rider Gaim

Hiroshi FujiokaTakeshi Hongo / Kamen Rider #1

Itsuji ItaoRen Aoi / Kamen Rider Fifteen

Masahiro InoueTsukasa Kadoya / Kamen Rider Decade