Episode 17-38 - Story Arc: The Man of One Hundred Million, the Other Ankh, and the Purple Medals ( 「1億の男ともうひとりのアンクと紫のメダル」編, Ichioku no Otoko to Mō Hitori no Anku to Murasaki no Medaru Hen).

Episode 01-16 - Story Arc: The Revive of Greeed, the Birth of OOO, and the Scramble of Medals ( 「グリード復活とオーズ誕生とメダル争奪」編, Gurīdo Fukkatsu to Ōzu Tanjō to Medaru Sōdatsu Hen).

The series is divided into three story arcs : Villains Main article: Greeed Greeed AnkhĮpisodes Main article: Kamen Rider OOO Episodes Movie/special-exclusive Kamen Rider Birth Characters Kamen Riders TV Show Kamen Rider OOO As Eiji fights the Greeed and their Yummy monsters, learning more of the Greeed and Ankh, he starts to find a purpose beyond his journey. The mysterious Kougami Foundation approaches Eiji and begins assisting him in his fight against the Greeed, though their true motives are not clear. When coin-based homunculi known as the Greeed awaken after their 800-year slumber to attack humans and feed off of their desires, the disembodied arm of the Greeed named Ankh gives Eiji a belt and three Medals to fight the other Greeed as Kamen Rider OOO. Eiji Hino is a traveling man who has no place to call home and a tragic past.

Kamen rider ooo episode 21