[Machine Translation] Heisei vs. Showa. This film was also a topic of discussion because it was decided by voting before the film's release which would win. The Heisei Rider won by a narrow margin with a total of over 2.7 million votes. The package includes a multi-ending version of the film that has never been shown in theaters, "Showa Rider's Victory Version. --There is another world inside the earth! Masked Rider Kota Katsuraba goes to investigate and meets the monsters of the Badan Empire and a man who calls himself Takeru Hongo. Hongo transforms into Masked Rider No. 1 and defeats the monsters one after another. I can't accept a chick like you as a Rider! Kota is bewildered. What is the Badan Empire? And what is the purpose of Masked Rider No. 1 and the other Showa Riders who have begun to move? Masked Rider Decade = Kadoyashi, who is pursuing a series of mysteries, visits Heisei Riders in order to obtain their cooperation. Then, a mysterious warrior, Masked Rider Fifteen, appears out of nowhere and defeats the Masked Riders one after another. Kota and the others try to get to the bottom of the situation, but the Showa Riders tell them that the Heisei Riders are the ones who brought the Badan Empire to earth.