As referenced in Kamen Rider Decade as well as featuring in other media, there are several worlds. The central world as currently occurring in Toei media has all Kamen Riders, Super SentaiImage:Icon-crosswiki.png and Space SheriffsImage:Icon-crosswiki.png, as well as some classic heroes operating in the same universe. The other worlds have versions of reality altered. It is openly stated that Tsukasa Kadoya, Decade, has a world all his own.