As several of Double's Gaia Memories are taken by the Cockroach Dopant, Shotaro tries to find his true identity while Philip tries to reunite the dance partners for their legendary move.
When the search for the Virus Dopant takes an unexpected turn, Shotaro and Philip must work to find the true controller and the reason behind their grudge.
Discovering a horrible secret from Saeko and seeing his partners captured by Arms Dopant, Philip must figure a way to save them even if using the unstable Fang Memory.
As Shotaro and Philip discover the truth regarding the teens using the Bird Memory, Kirihiko discovers the truth behind Museum and his usage by the Sonozaki family.
As Horinouchi is taken by the bizarre Shinkuro for further usage, Akiko tries to decipher the meaning of the doll and the truth behind Horinouchi's daughter.
An air-headed female magician who turns invisible asks Shotaro to find the seller of her Gaia Memory, which ultimately leads Ryu to the man who killed his family.
As Philip is taken by the Xtreme Memory to meet with Shroud, Shotaro continues to try and figure a way to discover the culprit behind Nightmare Dopant's attacks.
As Shotaro is asked to pursue a young teacher by her students, Ryu also goes after her due to a remarkable similarity between her and his deceased sister.
As Akiko desperately tries to complete Toru's movie, the insular director is targeted by Wakana for allowing her to access the full potential of her Dopant power.
Shotaro and Ryu are asked by a mother to save her daughter, who has been turned old to satisfy a grudge hit and then suddenly they are approached by Shroud who wants them to become Kamen Rider Double CycloneAccel Xtreme.
Ryu tries to decipher the truth regarding Shroud and her true purpose as she tries to force him and Philip to join together into the ultimate W to defeat Ryubee.
With Shotaro trapped in fear and Ryu injured, Philip is at the mercy of his father Ryubee, who prepares to use his deceased son and Wakana to bring about Gaia Impact.