Senran Kagura: Rider Generations (Kamen Rider x Senran Kagura collab)

For as long as the battles against Shocker have been waged against the humans, the heroic Kamen Riders have defeated the greatest of both them and other evils. But they're limelight would then soon fade, for what would happen if they're existence never came to be? In order to counter the threat of the temporal destruc...