World of Natsumi

, also referred as the 『仮面ライダー超辞典』監修：石森プロ・東映、双葉社、2011年7月24日。ISBN 978-4-575-30333-9。 is the world where Natsumi Hikari lived with her grandfather Eijiro at the Hikari Studio. It was also where Tsukasa Kadoya ended up having lost his memory and left Dai-Shocker. 
It was the center of the collapse of the multiverse as the Nine Worlds converged, causing hordes of monsters to come through the dimensional walls and begin to destroy the world. The destruction was frozen by Wataru Kurenai and his colleagues, who gave Tsukasa the mission to travel the Nine Worlds in the Hikari Studio and save reality as Kamen Rider Decade. 
Category:Kamen Rider Decade
Category:A.R. Worlds