Seasons & episodes
S21 · E1Medal, Underwear, Mysterious Arm 2010-09-05 · 25 min
A mysterious arm reawakens the Greeed from their slumber and decides to use Eiji Hino, a cheerful wanderer, as his means of getting back what he desires as Kamen Rider OOO.
S21 · E2Greed, Ice Candy, Present 2010-09-12 · 25 min
Ankh explains the Greeed and the purpose of the Medals to Eiji, even as the human desires to merely use his new power to fight for good instead of for selfish needs.
S21 · E3Cat, Evolution, A Glutton 2010-09-19 · 25 min
Ankh becomes troubled when Eiji prevents him from eliminating his possessed body's sister while another Greeed uses a man's gluttony to create more Medals.
S21 · E4Doubt, Photo E-mail, Saving Hand 2010-09-26 · 25 min
Ankh threatens to leave OOO for Kazari and the Greeed while investigating the evolution of humanity while Eiji tries to find more about Hina.
S21 · E5Game of Tag, Nest, Celebrity 2010-10-03 · 25 min
Kougami asks for a share of Eiji and Ankh's Medals, while Mezool decides to use Hina's shopaholic classmate to create a new Yummy.
S21 · E6Western Clothing, A Contract, Ultimate Combo 2010-10-10 · 25 min
Hina confronts Yamano's shopping addiction when her father goes bankrupt while Ankh confronts Kougami about his share deal of the Cell Medals.
S21 · E7Useless Husband, A Trap, Big Win 2010-10-17 · 25 min
Eiji tries to research a husband bullied by his wife that is being mocked by Gamel while Ankh follows a lead for a missing Core Medal.
S21 · E8Slacking Off, Lack of Ambition, On a Break 2010-10-24 · 25 min
Eiji gets to the root of the Komoris' problem involving greed and loss of ambition while Ankh fights for survival after a failed confrontation with Uva.
S21 · E9Soaked, The Past, Scorching Hot Combo 2010-10-31 · 25 min
A serial bomber tied to a nest of Yummies leads to Eiji to reveal his past to Hina and forces him to encounter a strange man he believes is Mezool's victim.
S21 · E10Fist, An Experiment, Super Bike 2010-11-14 · 25 min
Eiji must figure the means of stopping the mad bomber and his Yummies to prevent any more lost lives, even with Maki observing the creation of his worker's monsters.
S21 · E11Traveler, Swallowtail Butterfly, Celebrity 2010-11-21 · 25 min
Eiji's traveler friend becomes manipulated by Uva into becoming famous as he steals others attributes; while Gotou doubts Eiji's effectiveness as OOO.
S21 · E12Unagi, The World, Heavy-Hitter Combo 2010-11-28 · 25 min
Eiji teaches a lesson to Tsukuba and Gotou about going forth to gain what is desired; while Ankh tries to figure a way to manage the flying Ageha Yummy using Gamel.
S21 · E13Siamese Cat, Stress, Genius Surgeon 2010-12-05 · 25 min
Ankh is at a breaking point with everything surrounding his human host; a highly sought after doctor has been repeatedly removed from the operating room, making her frustration a perfect target for the Greeed.
S21 · E14Pride, Surgery, Secret 2010-12-12 · 25 min
Both Hina's brother and the hospital director are in critical condition after Ankh's detachment and the Yummy attack. Eiji must find both Ankh and the affected surgeon before it's too late.
S21 · E15Struggle for the Medals, Transport Truck, Container 2010-12-19 · 25 min
Ankh finds one of his core medals; Gotou is transporting a truck full of medals to Doctor Maki; Kazari appears to Ankh and Eiji, telling them that Hina is in Gotou's truck.
S21 · E16Conclusion, Greeed, New Rider 2010-12-26 · 25 min
Eiji learns about how the Greeed were born; Gamel searches for Mezool; Kamen Rider Birth joins the fight.
S21 · E17Kendo Girl, Oden, Splitting Yummy 2011-01-09 · 25 min
The Greeed take an interest in a girl who wants to get better at kendo; Ankh takes an interest in Kamen Rider Birth; Hina gives both Eiji and Ankh gifts for saving her.
S21 · E18Destruction, A Reason, Unagi Whip 2011-01-16 · 25 min
Eiji and Ankh try to find out the reason that the Yummy split in two, but Kamen Rider Birth is one step ahead of them.
S21 · E19A Red Medal, A Detective, A Betrayal 2011-01-23 · 25 min
Kougami tries to give Eiji one of Ankh's medals, but he refuses; a face from the detective's past shows up at Cous Coussier; thanks to Kazari, a criminal that the detective put away is on the streets and looking for revenge.
S21 · E20Decoy, Qualifications, Flaming Combo 2011-01-30 · 25 min
Ankh tricks Kazari by telling him that Eiji knows where his last medal is and then chases after Hina who has his own medal; Date and Gotou discuss the skills need to be Kamen Rider Birth; Kougami changes his mind and sends Ankh's medal to Eiji.
S21 · E21Hopper, Parent and Child, Hero 2011-02-06 · 25 min
The Cous Coussier gang runs into a young boy getting attacked for telling off a man for littering, learning that it's something he picked up from his father; the Greeed creates a Yummy from the desire to help people.
S21 · E22Choco, Conviction, Power of Justice 2011-02-13 · 25 min
Susumu lets his desire for justice get out of hand and it's up to Eiji to stop him before it's too late; Gotou and Takashi have a heart-to-heart conversation about their ideals.
S21 · E23Beauty, Egg, Dormant Desire 2011-02-20 · 25 min
Kazari is drawn to the vanity of woman whose sister takes all the credit for her work.
S21 · E24Memory, Love, Sea Combo 2011-02-27 · 25 min
Eiji is head over heels for Yuumi and it's up to Date to save his old friend before she does something that she'll regret.