Akiko Narumi arrives in Futo to be the landlord of the "hard-boiled" detective Shotaro Hidari, who finds himself involved in a case involving an old friend and a Dopant.

After his missing target is killed by another Dopant, Shotaro works with his partner Philip to figure out the truth regarding the killer while being dogged by Akiko and her strange sightings.

Shotaro is hired to save a girl from a legendary casino who offers ultimate riches for victory - and ultimate penalty for loss.

Tracking down the legendary casino, Shotaro must defeat its Dopant owner as Philip deals with a crisis hindering his mental abilities.

Shotaro is hired to protect from an assassin a councilwoman and her daughter, who believes Double is her father.

Shotaro debates the cost of keeping up Asuka's belief Double is her father as Museum steps up their motive in protecting their Gaia Memory factory.

Philip chases after a street dancer key to a locked memory, while Shotaro pursues a cockroach avenger taking out hired victims.

Shotaro tries to find the Cockroach Dopant's identity - in order to regain Double's missing Gaia Memories. Meanwhile, Philip tries to reunite the dance partners for their legendary move.

Akiko gets a job as a maid of the Sonozaki family in order to investigate a Dopant abducting pastry chefs.

Shotaro gets embroiled deeper in the Sonozakis connection to the Dopants as Akiko attempts to solve the criminal behind the patisserie abductions.

Shotaro decides to help an underworld gang after a member is killed by a Dopant-possessed car.

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.

Shotaro and Philip investigate a Dopant stalker causing chaos in order to impress Wakana.

As Shotaro continues to try and lure out Wakana's violent stalker, Philip continues to get unusually close to the radio-broadcasting Sonozaki.

A suspicious woman hires Shotaro to find a Dopant who is running amok while taking the name "Kamen Rider" as his own.

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.

When Shotaro is hired to find the daughter of his barber, he discovers horrible new developments regarding the Gaia Memories.

As Shotaro and Philip discover the truth regarding the teens using the Bird Memory, Kirihiko discovers the truth behind the Museum organisation.

The new leader of Fuuto Police's Dopant investigation division uses Shotaro to track down a Dopant attacking victims with ice.

As Ryu's intensity threatens to harm innocents, Shotaro and Philip must discover the reason behind his anger while putting a stop to the ice-powered Dopant.

Makura involves Shotaro in a case in rooting out a traitor within the Fuuto police leaking out information on the Gaia Memories.

Aya tries to gain Shotaro and Ryu's trust in using her Dopant power to be an asset, hiding her true intentions and desires of her situation.

A request from Queen and Elizabeth leads to an investigation of a terrible street performer mysteriously winning a popular singing competition.

While trying to figure a means to defeat the tricky Liar Dopant, Shotaro confronts Jimmy about his confidence and trust in his only fan.

Akiko is asked by a little girl to find her lost doll, which has been terrorizing targets throughout Fuuto.

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.

Akiko and Philip desperately try to stop Ryu from taking immediate revenge on Shinkuro when he becomes key to saving Lily from her deadly Gaia Memory.

Shotaro accepted a request from a girl fearing a Dopant who attacks its victims in their dreams which it can control.

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.

After being in prison for 10 years, an old client of Sokichi's asks Shotaro to help him uncover some information - which he had asked Sokichi to look into before being arrested.

While under pressure of being abandoned by Philip as his Double partner for not keeping up, Shotaro tries to decipher the truth behind Bito's framing.

Shotaro decides to help a peculiar woman find her lost cat while Ryu investigates people committing strange actions beyond their control.

Shotaro fights to prevent Yukie from joining Museum for the sake of herself and of the memory of her deceased brother Kirihiko.

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.

Ryu must master the Trial Memory in order to save Nagi from Shinkuro, who has made his move with Saeko for Ryubee's downfall.

Shotaro is hired to find a mysterious man's family, while Philip is confronted by Wakana about her position in Museum with her sister gone.

As Ryu tries to gain more information regarding Yamashiro's knowledge of Museum, Philip contemplates leaving Futo forever with Wakana.

Shotaro is brought in to help a movie-theater worker who has unknowingly become the star of an epic others are forced to watch.

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.

Jinno asks Shotaro to help him find a cold-hearted, diamond-obsessed woman who set him up for arrest.

Shotaro fights to save Rui from destroying herself, while Philip tries to figure out how to outsmart Wakana in gaining his library research.

Shotaro and Ryu are asked by a mother to save her daughter, who has become an old woman. Meanwhile, Shroud wants Phillip and Ryu 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.

A request from a worker at the Futo museum forces Shotaro to find an artifact required by Ryubee for his final master plan.

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.

Philip chooses to ask Shotaro to help him find Wakana, who is being held by Kazu for Foundation X's own plans, so he could see her one last time.

Shotaro and Philip must endure the ultimate hardships in order to stop Kazu from completing his own Gaia Impact to complete what could be their final case together.

One year after Philip's departure, Shotaro continues onward; but a case involving saving a boy's sister from Dopant thugs brings forth a change for the better.