Surprise Attack, Proto Birth, Desire for Love
With Birth in need of repair, Erika retrieves the Prototype Birth driver in order to make do; because they are at a major disadvantage, Eiji and Gotou decide to go on the offense and attack the Greeed first; the other Greeed confront Dr. Maki and Ankh, with Mezool fully reviving and leaving Gamel, who also has the remainder of his medals.
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More from this season
S21 E1
Medal, Underwear, Mysterious Arm
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 E2
Greed, Ice Candy, Present
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 E3
Cat, Evolution, A Glutton
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 E4
Doubt, Photo E-mail, Saving Hand
Ankh threatens to leave OOO for Kazari and the Greeed while investigating the evolution of humanity while Eiji tries to find more about Hina.