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Icon-w.png This article is about a/an character in Kamen Rider W.

"I didn't hear about this!"
―when commenting on something that is new to her[src]

Akiko Narumi (鳴海 亜樹子 Narumi Akiko) is the lead female character of Kamen Rider W and head of the Narumi Detective Agency after inheriting it from her deceased father, Sokichi Narumi. In Futo Detective, she is legally known as Akiko Terui (照井 亜樹子 Terui Akiko) after her marriage to Ryu Terui and listed as such in official family registry, but chooses to use her maiden name when working at the agency to uphold the legacy and reputation of her father.

Part in Story

Akiko nearly gets herself killed

Akiko is Shotaro Hidari's landlady and boss, though she serves as a personal assistant to Shotaro while on the job and keeping him at bay by slapping him with a green sandal with different inscriptions on it each time (sometimes two at once); she uses this on others as well, including Dopants. She came from Osaka to continue in her father's place, initially unaware that Sokichi died until the events of Begin's Night. Before taking control of the Agency she met a little girl named Riko, who's spirit helps her in the case of the Puppeteer Dopant. She nearly gets herself killed by Money Dopant when Akiko reveals herself.

During the cases of the Sweets, and Puppeteer Dopants, Akiko played a major role in finding out the Dopants' causes and getting Horinouchi on the right track after he is defeated. She also got involved in the Nightmare Dopant case, in a dream becoming Kamen Rider Double but ends up under the Dopant's powers. Fortunately she is freed from its influence when the Dopant is defeated.

Movie War Core

During the events of Movie War Core she married Ryu Terui, trying to place a ban on him being a Rider when it interfered with the ceremony. However, after seeing all the things her father went through as Skull (via the Memory Memory) and hearing his reasons for staying a Rider, she let him continue being a Rider and they married, her father's spirit walking her down the aisle.

W Returns: Accel

During the events of W Returns: Accel she threatened to divorce her husband due to how secretive Ryu was being.

Drive Saga: Chaser

In Drive Saga: Chaser, she and Ryu at some point conceived a daughter named Haruna. She's briefly mentioned by her husband while having a phone conversation with her about their daughter after he helped Kamen Rider Drive and Kamen Rider Mach fighting against a Roidmude evolved Beast Dopant.

Memory of Heroez

Akiko calls to check up on Shotaro and Philip during their adventures in Sector City.



Hideyoshi and Chacha

Main article: Chacha

Chacha (チャチャ) is the wife of Hideyoshi that greatly resembles Akiko Terui (née Narumi). Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle

Chacha is portrayed by Hikaru Yamamoto (山本 ひかる Yamamoto Hikaru), who previously portrayed Akiko Terui (née Narumi) from Kamen Rider W.

Video Game appearances

Kamen Rider Travelers Record

Akiko appears in the video game Kamen Rider Travelers Record.


Akiko appears rather childish for her age (20) and due to her young appearance and attitude, Shotaro refers to her as "Middle school Girl" (女子中学生 Joshi Chūgakusei) and sees her as a threat to his public image. She has a black and white view of the world and tends to say "I didn't hear about this!" (私聞いてない! Atashi kiitenai!) when she is caught off guard by something.

Whenever she is around witnessing Shotaro and Phillip transforming into Double, she would be the one to carry Phillip's comatose body to a safe location. When the two use transform into FangJoker instead, Akiko would be suprised to carry Shotaro's body instead, much to his dismay.

Despite her somewhat childish personality, she has shown signs of promise as a detective, particularly in her ability to decipher clues that left Shotaro, Phillip, and Ryu stumped, as well as being extremely protective of clients, a trait she shares with her father. 

Akiko harbored a crush on Ryu Terui, and although her feelings were initially ignored, he eventually returned them during the events of W Forever, as they watched the fireworks together and fell in love. They eventually married in Movie War Core.


Akiko is a regular human with no unique physiology and lacks Gaia Memories unlike most other major characters of the series. Still she uses the aforementioned sandals with different writings on them during certain situations that seem to work even against Dopants. She also talks in her sleep which helped out in the Nightmare Dopant case.

At first Philip showed no attention to her after researching about her from the Gaia Library, but was later interested on her unusual lucky suggestions, which often gives inspiration in solving most of their Dopant cases.

Her appearance of becoming Double lead to the creation of Double Ganbaride cards featuring giant versions of Akiko's signature sandals during Double's Finisher.


In one episode, she was dreaming where she is the body of Kamen Rider Double and Shotaro is the mind, Akiko uses Double's powers to a good effect but was defeated after just getting punched in the face, though this could've been just a way to reveal the Dopant's identity. As Double, the Double Driver calls her the "Masked Beautiful Girl of Naniwa" during the transformation.



"Cyclone, Joker! (Technical guitar to orchestral hit)"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 195 cm.
  • Rider Weight: 85 kg.

Ability Perimeters:

  • Punching Power: 2.5 tons
  • Kicking Power: 6 tons
  • Maximum Jump Height: 60 m.
  • Maximum Running Speed: 100 m. per 5.2 sec.

Joker Big Slipper Ganbaride Card

While in this form, Akiko had the powers of CycloneJoker.

In the Ganbaride arcade game, she has her own Maximum Drive finisher as CycloneJoker; The Joker Big Slipper (ジョーカービッグスリッパ Jōkā Biggu Surippa), a variant of the Joker Extreme where a giant sized version of Akiko's green slipper appears and swirls around the cyclone generated by Double. The slipper then flies into the air and Double connects her feet with the slipper, using it to smack the opponent repeatedly and then stomp them flat, causing the target to explode.



"Heat, Metal! (Rock & roll guitar music to metallic synth)"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 195 cm.
  • Rider Weight: 105 kg.

Ability Perimeters:

  • Punching Power: 6 tons
  • Kicking Power: 9 tons
  • Maximum Jump Height: 25 m.
  • Maximum Running Speed: 100 m. per 11 sec.



"Luna, Trigger! (Ominous glowing sound to rock guitar riffs)"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 195 cm.
  • Rider Weight: 80 kg.

Ability Perimeters:

  • Punching Power: 3.5 tons
  • Kicking Power: 4.5 tons
  • Maximum Jump Height: 45 m.
  • Maximum Running Speed: 100 m. per 8.5 sec.

Futo Dopant


  • Height: cm.
  • Weight: kg.
This form is exclusive to Kamen Rider W: Final Stage.




  • Maximum Slots - Gaia Memory slot that enables Double to perform Maximum Drive as barehanded.
  • Metal Shaft - Extendable quarter staff in conjunction with any form that uses the Metal Memory.
  • Trigger Magnum - Firearm in conjunction with any form that uses the Trigger Memory.
  • Prism Bicker - A pair of sword and shield that used in CycloneJokerXtreme.
  • Maximum Slots - Gaia Memory slot that enables Joker to perform Maximum Drive as barehanded.

Behind the scenes


Akiko Narumi is portrayed by Hikaru Yamamoto (山本 ひかる Yamamoto Hikaru). As a child, Akiko is portrayed by Saho Ueda (上田 紗帆 Ueda Saho) in Kamen Rider Skull: Message for Double.




Icon-w.png Kamen Rider W
Narumi Detective Agency
Shotaro Hidari - Philip - Akiko Narumi - Sokichi Narumi† - Tokime
Memory Drivers
Double Driver - Accel Driver - Lost Driver
Gaia Memory-related
Gaia Memories - Memory Gadgets - Fang Memory - Xtreme Memory - Trial Memory - Gaia Memory Enhancing Adapter
Metal Shaft - Trigger Magnum - Engine Blade - Skull Magnum - Prism Bicker - Eternal Edge - Shroud Magnum
RevolGarry - HardBoilder - Gunner A - Diablossa - SkullBoilder - SkullGarry - HardMammother
The Fuuto Irregulars
Santa-chan - Watcherman- Queen & Elizabeth - Isamu Bito
Futo Police Department
Ryu Terui - Mikio Jinno - Shun Makura
Museum and the Dopants
Foundation X
The Sonozaki Family: Terror - Claydoll - Taboo/R Nasca - Nasca - Smilodon - Masquerade Dopants
Dopants: Magma Dopant - T-Rex Dopant - Money Dopant - Anomalocaris Dopant - Cockroach Dopant - Sweets Dopant - Virus Dopant - Violence Dopant - Arms Dopant - Bird Dopant - Ice Age Dopant - Triceratops Dopant - Liar Dopant - Puppeteer Dopant - Invisible Dopant - Nightmare Dopant - Beast Dopant - Zone Dopant - Yesterday Dopant - Quetzalcoatlus Dopant - Gene Dopant - Jewel Dopant - Old Dopant - Utopia Dopant - Energy Dopant
Movie Exclusive Villains: Dummy Dopant - Heat Dopant - Trigger Dopant - Metal Dopant - Luna Dopant - Cyclone Dopant - Bat Dopant - Spider Dopant - Kamen Rider Eternal - Commander Dopant - Eyes Dopant
Novel-Exclusive Villains (The One Who Continues After Z): Zoo Dopant - Zero Dopant - Queen Bee Dopant - Flower Dopant - Elephant Dopant - Dolphin Dopant - Salamander Dopant - Fish Dopant - Bird Dopant - Ape Dopant - Bee Dopants
Manga Exclusive Villains (Futo Detective): Road Dopant - Aurora Dopant - Meganeura Dopant -Brachiosaurus Dopant - Scream Dopant - Alcohol Dopant - Puzzle Dopant - Reactor Dopant - Antlion Dopant - Owl Dopant - Trash Dopant - Caracal Dopant - Toadstool Dopant
Yukiji Bando - Kazuha - Hideo - Mamoru Nikaido - Sabu
Katsumi Daido - Maria S. Cranberry - Reika Hanehara - Kyosui Izumi - Gozo Domoto - Ken Ashihara
Fuuto PI Chapters
1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46