Kamen raidâ Ôzu

Eiji Hino is a young man who travels the world, trying to escape a tragic event from his past. When metallic creatures known as the Greeed awaken after their 800-year slumber to attack humans and feed off of their desires, a disembodied arm of the Greeed named Ankh gives Eiji a belt and three Medals to fight the other Greeed as Kamen Rider OOO.