A mysterious person restarts the Mirror World's Rider Battle, thus making Shinji Kido and other war participants regain their memories and transforming abilities. With the appearance of Another Ryuki, Sougo Tokiwa and Geiz Myokoin investigate this event, becoming involved in the war themselves...

Five characters who "should not be in this world" have appeared before Emu. These characters are Kamen Riders who have either died or disappeared. The mystery behind their revival is linked both to someone manipulating strings behind the scenes and the "ultimate superhero team" Kamen Sentai Gorider.