So basically this series is about Not-Shinken Red, Handicapped Tsukasa, Nago (who somehow merged with both versions of Kengo, getting one's hair and the other's attitude) and Kai With Glasses all trapped in the same underground place from the last episode of Faiz/Kamen Rider THE FIRST/those Hibiki episodes with the thing that was actually part of a giant fish/Kabuto World in Decade/That Ultra Q Dark Fantasy episode with the gas mask guys/something else, along with some other people, and its all part of the TOTALLY ORIGINAL!™ idea of putting people into a deadly 'game' where there's a time limit, which from above actually looks like they're in Pac-Man and they're also trying to evade a gang of Emperor Palpatines who want to stomp them to death?