The Hikari Studio arrives in a new world. Natsumi realizes that they're in Decade's World, Tsukasa's home, as his photos are developing perfectly. Tsukasa and company meet a girl called Sayo, who says that Tsukasa is her brother. Tsukasa doesn't remember her as Nobuhiko Tsukikage tells him that his arrival has distorted the world and only the strongest Rider can stop it. Regaining his memory, Tsukasa has Nobuhiko summon every Rider to find the strongest one. The battle comes down to Decade, Kuuga, and Diend vs. V3, Black, and Super-1. Decade's team wins, Tsukasa and co. end up in a castle with Eijiro, who reveals himself to be Dr. Shinigami of Dai Shocker. He welcomes Tsukasa as their leader. Natsumi and Yuusuke learn that Nobuhiko and Sayo are with Dai Shocker too. Nobuhiko attacks Yuusuke as Shadow Moon, awakening the most dangerous of Kuuga's powers. Sayo cannot forgive Tsukasa for leaving her and she has now become High Priestess Bishium. Tsukasa is attacked by Nobuhiko and Yuusuke as Kuuga Rising Ultimate controlled by Sayo. Tsukasa escapes, but Natsumi refuses to trust him knowing that he is the leader of Dai Shocker. Later, Natsumi is saved from Dai Shocker's attacks on the city by Narutaki. They meet Daiki, with Narutaki who telling him that the only way to save the world is to gather the other Kamen Riders. Tsukasa encounters J&訅ji Yuki and after a brief fight, Yuki helps Tsukasa escape Dai Shocker using his powers as Riderman. Daiki meets Kamen Riders Ohja and Kick Hopper and asks them to fight Dai Shocker, but they decide join it instead. Diend summons Raia, Gai, and Punch Hopper to fight them. An ambush under General Jark is then stopped by Tsukasa and Daiki. On the way to Dai Shocker's castle, Tsukasa, Natsumi and Daiki are met by the entire Dai Shocker army led by Shinigami and Ambassador Hell. The two are destroyed by the arrival of the other Riders. Tsukasa makes Sayo realize that Nubohiko is using her and she frees Yuusuke from her control. The three Riders fight Shadow Moon until the new Kamen Rider Double arrives. Double defeats Shadow Moon before leaving. All the other Riders join Decade in destroying Shadow Moon and the Dai Shocker castle. The awakened King Dark is destroyed by Kamen Rider J as Decade Complete Form's Jumbo Formation. After reconciling with Sayo, Tsukasa decides to continue his journey with the Hikari Studio, his true home.
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