Nine universes of the previous Kamen Riders merging into one that would destroy all the worlds. Tsukasa Kadoya transforms into Kamen Rider Decade and travels to all of the Another Rider's worlds and eliminate the anomalies in those worlds.
Nine universes of the previous Kamen Riders merging into one that would destroy all the worlds. Tsukasa Kadoya transforms into Kamen Rider Decade and travels to all of the Another Rider's worlds and eliminate the anomalies in those worlds.