Eiji Hino is a wanderer who has no place to call home and a tragic past. When metallic creatures 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. The mysterious Kougami Foundation approaches Eiji and begins assisting him in his fight against the Greeed, though their true motives are not clear. As Eiji fights the Greeed and their Yummy monsters, learning more about the Greeed and Ankh, he starts to find a purpose beyond his journey.
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Shu Watanabe
Eiji Hino / Kamen Rider OOO
Ryosuke Miura
Ankh / Shingo Izumi
Riho Takada
Hina Izumi
Asaya Kimijima
Shintaro Goto / Kamen Rider Birth
Takashi Ukaji
Kousei Kougami
Mayuko Arisue
Erika Satonaka
Hiroaki Iwanaga
Akira Date / Kamen Rider Proto-Birth
Honoka Yahagi
Mezool (Human Form)
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48 episodes • 2010
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | Medals, Underwear, and the Mysterious Arm | Sep 5, 2010 | 0.0 |
| 2 | Desire, Ice Pops, and Presents | Sep 12, 2010 | 0.0 |
| 3 | A Cat, Evolution, and a Glutton | Sep 19, 2010 | 0.0 |
| 4 | Doubt, a Picture Message, and a Helping Hand | Sep 26, 2010 | 0.0 |
| 5 | A Game of Tag, a Nest, and a Rich Girl | Oct 3, 2010 | 0.0 |
| 6 | Fashion, a Contract, and the Strongest Combo | Oct 10, 2010 | 0.0 |
| 7 | A Lousy Husband, a Trap, and a Jackpot | Oct 17, 2010 | 0.0 |
| 8 | Sabotage, Unselfish, and Taking a Break | Oct 24, 2010 | 0.0 |
| 9 | Drenched, the Past, and the Scorching Combo | Oct 31, 2010 | 0.0 |
| 10 | A Fist, an Experiment, and a Super Bike | Nov 14, 2010 | 0.0 |
| 11 | The Traveler, a Swallowtail Butterfly, and a Celebrity | Nov 21, 2010 | 0.0 |
| 12 | An Eel, the World, and the Gravity Combo | Nov 28, 2010 | 0.0 |
| 13 | A Siamese Cat, Stress and the Genius Surgeon | Dec 5, 2010 | 0.0 |
| 14 | Pride, Surgery, and a Secret | Dec 12, 2010 | 0.0 |
| 15 | The Medal Struggles, the Transporter, and the Vessel | Dec 19, 2010 | 0.0 |
| 16 | An End, the Greeed, and a New Rider | Dec 26, 2010 | 0.0 |
| 17 | The Kendo Girl, Oden, and the Splitting Yummy | Jan 9, 2011 | 0.0 |
| 18 | Destruction, Motives, and the Eel Whip | Jan 16, 2011 | 0.0 |
| 19 | The Red Medal, the Detective, and Betrayal | Jan 23, 2011 | 0.0 |
| 20 | The Decoy, Quantification, and the Flaming Combo | Jan 30, 2011 | 0.0 |
| 21 | The Grasshopper, Father and Son, and the Ally of Justice | Feb 6, 2011 | 0.0 |
| 22 | Chocolate, Faith, and the Power of Justice | Feb 13, 2011 | 0.0 |
| 23 | Beauty, an Egg, and the Sleeping Desire | Feb 20, 2011 | 0.0 |
| 24 | Memories, Love, and the Marine Combo | Feb 27, 2011 | 0.0 |
| 25 | The Boxer, the Left Hand, and the Bird Yummy | Mar 6, 2011 | 0.0 |
| 26 | Ankh, the Ring, and Placing Everything On | Mar 20, 2011 | 0.0 |
| 27 | 1000, the Movie, and the Combatmen | Mar 27, 2011 | 0.0 |
| 28 | 1000, the Kamen Riders, and the Birthday | Apr 3, 2011 | 0.0 |
| 29 | The Big Sister, the Doctor, and the Truth about Ankh | Mar 20, 2011 | 0.0 |
| 30 | The King, the Panda, and the Flames of the Memory | Mar 27, 2011 | 0.0 |
| 31 | Gratitude, Scheming, and the Purple Medal | Apr 3, 2011 | 0.0 |
| 32 | The New Greeed, Emptiness, and the Invincible Combo | Apr 10, 2011 | 0.0 |
| 33 | Friendship, Chaos, and the Belt Left Behind | Apr 17, 2011 | 0.0 |
| 34 | The Best Friend, Uses, and Their Relationship | Apr 24, 2011 | 0.0 |
| 35 | Dreams, the Big Brother, and Birth's Secret | May 1, 2011 | 0.0 |
| 36 | Broken Dreams, the Body, and the Greeed Resurrection | May 8, 2011 | 0.0 |
| 37 | Sleep, One Hundred Million, and the Birth Transfer | May 15, 2011 | 0.0 |
| 38 | Circumstances, Farewell, and a Tearful Birth | May 22, 2011 | 0.0 |
| 39 | The Nightmare, Security Cameras, and Ankh's Revenge | May 29, 2011 | 0.0 |
| 40 | Control, a Birthday Party, and the Disappearing Ankh | Jun 5, 2011 | 0.0 |
| 41 | Siblings, the Rescue, and Eiji Leaves | Jun 12, 2011 | 0.0 |
| 42 | Ice, Greeedification, and Broken Wings | Jun 19, 2011 | 0.0 |
| 43 | The Vulture, the Confrontation, and Ankh Returns | Jun 26, 2011 | 0.0 |
| 44 | Everyone Together, the Perfect Resurrection, and Your Greed | Jul 3, 2011 | 0.0 |
| 45 | The Surprise Attack, the Proto Birth, and the Desire of Love | Jul 10, 2011 | 0.0 |
| 46 | The Eiji Greeed, the Double Births, and Ankh's Desire | Jul 17, 2011 | 0.0 |
| 47 | The Red Crack, Satisfaction, and Eiji's Vessel | Jul 24, 2011 | 0.0 |
| 48 | The Medals of Tomorrow, Underwear, and Arms Held | Jul 31, 2011 | 0.0 |
