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Icon-decade.pngThis article is about a rider in Kamen Rider Decade.

For the World of Negatives version, see Natsumi Hikari (A.R. World).

Natsumi Hikari (光 夏海, Hikari Natsumi) is a young woman who works at the Hikari Photo Studio under her grandfather, Eijiro Hikari while traveling through the A.R. Worlds with Tsukasa.

Eventually, she becomes Kamen Rider Kiva-la (仮面ライダーキバーラ, Kamen Raidā Kibāra, Masked Rider Kiva-la), a Kamen Rider appearing in Kamen Rider Decade: The Last Story. Similar to other riders in the series, Kiva-la is an original Kamen Rider with origins coming from an A.R. World. Though unlike them, Natsumi does not come from an A.R. World and only used her powers thrice.



Natsumi Hikari is the granddaughter of Eijiro Hikari and lived with him in his photo studio, Hikari Studio. In high school, Natsumi and her group of friends formed the Taigaku Club, or the "TG Club". The club was created for students who intended to drop out of high school to find their own answers in life. Eventually, they changed their minds and decided to finish high school, dissolving the TG Club and promising to meet each other again later on.

As a young adult, Natsumi came across the new employee of Hikari Studio, who went by Tsukasa Kadoya. She is often irritated by Tsukasa's antics towards the other customers due to the distorted images he takes and his negative attitude. She occasionally uses the Hikari family's "secret technique", the Laughter Point (笑いのツボ, Warai no tsubo), to keep Tsukasa in line by striking a pressure point on the target's neck that causes them to laugh uncontrollably.

The Destruction of Her World

For a while, Natsumi has been receiving reccuring nightmares of a war involving Kamen Riders united against a single force known as "Decade". After leaving the studio to scold Tsukasa over his bad photos, the both of them are separated by an Aurora Curtain. While running away from being chased by monsters, she discovers the Decadriver and Rider Cards from a rubble. When she finally runs into Tsukasa again, she hands him the belt and cards right before being attacked by monsters. Natsumi was present when Tsukasa transformed into Kamen Rider Decade and watched him defeat the horde of Worm, Orphnoch, and Makamou. Confused by the ordeal, Natsumi and Tsukasa find her world besieged by monsters. With Tsukasa given the task to travel to nine worlds to prevent the destruction of this world, Natsumi decides to accompany him on his journey.

Traveling Through The Nine Worlds

Starting in the World of Kuuga, Natsumi continues to watch over Tsukasa and continues to worry that in the end, Decade will end up becoming a villain just like in her dreams. This all came ahead when Kamen Rider Kuuga, Yusuke Onodera, opposed Tsukasa which triggered another event in her dreams where Decade fought Kuuga, which worried Natsumi. Fortunately, Tsukasa and Yusuke ended up joining forces to defeat the Gurongi N·Gamio·Zeda from taking over the world. After the issue was solved, Natsumi would continue to follow Tsukasa in the World of Kiva where Yusuke would continue to accompany them.

After arriving in the World of Ryuki, she meets up with Reiko Momoi from Atashi Journal to question about the potential destruction of her world, only for Momoi to die under mysterious circumstances. Natsumi was later arrested and is judged during the Rider Trial where the Kamen Riders will fight each other in order to decide whether or not she is guilty, with Tsukasa as her lawyer. Fortunately, Decade and Ryuki managed to prevent Momoi's murder and also preventing Natsumi from being arrested. She would proceed on to the next world, heading towards the World of Blade.

Sometime after appearing in the World of Faiz, Natsumi along with Tsukasa and Yusuke would come across Daiki Kaito, who can transform into Kamen Rider Diend. Daiki is an inter-dimensional phantom thief travels through the A.R. Worlds in order to steal items he deems as treasures belonging to said worlds, while crossing paths with the Hikari Studio on many occasions.

After completing their mission in the World of Agito, Natsumi would arrive in the World of Den-O where she is present to see Tsukasa becoming Kamen Rider Den-O under the possession of an Momotaros, before forcing him into Yusuke's body. While trying to find Yusuke, Natsumi would end up being possessed by the other Taros and forced to fight Tsukasa as Den-O herself. Tsukasa and Natsumi would eventually be informed of the various time distortions of this world and would seemingly fix the problem. The Hikari Studio team later proceeded onto the World of Kabuto.

Landing in the last of the nine worlds, the World of Hibiki, Natsumi would be informed by Narutaki that she is the key to stopping Decade from destroying the worlds. Despite Narutaki's offer to save her, Natsumi chooses to stay with Tsukasa until the end of their journey, not believing him to be "the destroyer of worlds" that Narutaki makes him out to be. However, she starts to worry after hearing from Narutaki later on that Tsukasa's actions are actually destroying the worlds rather than saving them.

Going For The New Worlds

With the journey over, Tsukasa and the others of the Hikari Studio return to what appears to be Natsumi's world to find it back to normal as if it was not plagued by the monsters. While Natsumi reunited with her friends, she later comes across a doppelgänger of herself who reveals that this world is actually the World of Negatives and the Dark Riders have impersonated her friends. Natsumi would later give Tsukasa the treasure of this world, the K-Touch, allowing Decade to access his Complete Form to vanquish the Dark Riders. After saying goodbyes to her alternate self, Natsumi decides to continue travelling to the new worlds just as they arrived in Daiki Kaito's homeworld.

Arriving in the World of Diend, it appears to be a utopic society of happy and positive individuals, only to learn that this world is under the control of Fourteen and his Darkroachi. Natsumi is kidnapped by the Roaches to be conditioned into being a normal member of this world's society. After Fourteen's defeat, Natsumi is restored back to normal and would continue to travel to the next world.

In the World of Shinkenger, Natsumi is visibly worried for Tsukasa as he continues to explore a world without Kamen Riders. Natsumi would learn that even without Riders, this world is protected by the Samurai Sentai Shinkengers. After Tsukasa and Yusuke returned, she assures the former that the Hikari Studio will always be Tsukasa's home as where he came from, as it is the place that he "always returns to".

Entering the World of RX, she puts herself between Apollogeist and Tsukasa, deflecting Apollogeists's Perfecter, which was meant to drain the life energy from Tsukasa to prolong Apollogeist's life. Eventually she succumbs to the injury and dies in the hospital, as Daiki prevents Tsukasa from retrieving the Perfecter in time to save her life, but Tsukasa gives up part of his own life energy to revive her.

In the World of Amazon, she starts to truly wonder if there is a point in their journey, but continues in spite of that doubt. Just as the Hikari Studio crew begin to head towards the next world with Daiki accompanying them, Natsumi is shocked to learn that backdrop of the next and final world looks just like her dreams with the Kamen Riders charging after Decade.

World of the Rider War

Natsumi arrives into the final world, where all the Kamen Riders are supposed to be; "World of the Rider War". It is the same place that Natsumi saw when she had her dream about the war. Natsumi reveals to the others about her nightmares and desires to prevent it from happening. She is kidnapped by Apollogeist, who intends to make her his bride and feed off of her life force. She is saved by her comrades, but her nightmares become reality and the Rider War begins, despite their efforts to stop it. Natsumi is forced to witness the defeat of the Kamen Riders and Decade standing menacingly as she calls out his name.

Decade's Final Chapter

Natsumi's transformation into Kiva-la

In Decade: Final Chapter, Natsumi and her grandfather live alone again, after Decade accepted his role as the Destroyer of Worlds. She tries to convince Tsukasa to stop what he's doing, but fails to make him see things her way after killing Yusuke. Instead, she becomes Kamen Rider Kiva-la, and fulfills her role as Decade's destroyer, as he allows her to kill him. Before dying, Tsukasa hands her the Rider Cards that the other Kamen Riders turned into after their defeat and asks her to remember them. The other Kamen Riders are revived, and Decade disappears.

After being told of Tsukasa's true role, she seeks out a way to revive him and succeeds by developing a half-exposed photo negative from inside Tsukasa's camera. Because it is a photo Natsumi took herself, it isn't warped, and she and the other A.R. Kamen Riders are able to fill in the blank areas of the photograph with their memories. Reunited with the rest of the group at last, Natsumi becomes Kamen Rider Kiva-la again to stop Super Shocker with Tsukasa, Daiki, and Yusuke and saves her grandfather after he reverts from Dr. Super Shinigami. She is last seen with her friends taking a picture after the conflict, after announcing their intent to continue traveling together.

Later Appearances

Rider Time: Decade vs. Zi-O

Natsumi as Kiva-la appears alongside Kuuga and Diend assisting Zi-O and Decade to defeat Ohma Zi-O but are unable to defeat him. Final Chapter: The FINAL Stage

Video Game Appearances

Kamen Rider Buttobasoul

Kamen Rider Kiva-la Medal

Kamen Rider Kiva-la is a playable character in Kamen Rider Buttobasoul.

Masked Rider Expansion

Kamen Rider Kiva-La Masked Rider Expansion card

Kamen Rider Kiva-La appears as a playable character in this trading card game with other Heisei era and Showa era riders.

Kamen Rider Battle: Ganbarizing




Kamen Rider Kiva-la

―Transformation announcement via Kiva-la[src]
  • Height: 175 cm
  • Weight: 60 kg
  • Punching power: 3 t
  • Kicking power: 6 t
  • Maximum jump height: 70 m
  • Maximum running speed: 100 m per 7 seconds

Natsumi transforms into Kamen Rider Kiva-la (仮面ライダーキバーラ, Kamen Raidā Kibāra) with the aid of Kiva-la. Kamen Rider Kiva-la is armed with the Kiva-la Saber, which she can use to perform her finishing attack, the Sonic Stab (ソニックスタッブ, Sonikku Sutabbu), which has two variations:

  • Kiva-la deploys wings of light from her back and flies toward the enemy at high speeds before slashing them.
  • Kiva-la delivers a powerful horizontal slash to the enemy covered in white and purple energy.
Appereances: W & Decade: Movie War 2010, Decade VS Zi-O -Decade Mansion's Death Game- Episode 3

Rod Form

Rod Form

"Rod Form!"
―Transformation announcement[src]
  • Rider height: 187 cm[1]
  • Rider weight: 102 kg[1]
  • Punching power: 4.5 t[1]
  • Kicking power: 9 t[1]
  • Maximum jump height: 20 m[1]
  • Maximum running speed: 100 m per 9 sec[1]
When possessing Natsumi (or anyone else) or by himself Urataros can assume Rod Form. The DenGasher forms into a rod-style weapon in this form. Rod Form gains the ability to fight underwater, extra protection, and increased kicking power, while losing speed and jump height. This is one of the more least seen forms as Urataros rarely fights but comes through when a fight is close to water or when the other Imagin are unable to fight. Rod Form is also one of the two base forms that have a Rider Kick, the second is Sword Form in the Cho Den-O Series. Urataros throws his rod like a harpoon then after a hexagonal symbol appears he attacks with a flying side kick. The Aura Armor and DenKamen mask resembles a Sea Turtle, the animal associated with the story of Urashima Taro.

Ax Form

Ax Form

"Ax Form!"
―Transformation announcement[src]
  • Height: 185 cm[2]
  • Weight: 93 kg[2]
  • Punching power: 8 t[2]
  • Kicking power: 5 t[2]
  • Maximum jump height: 30 m[2]
  • Maximum running speed: 100 m per 7 sec[2]

When possessing Natsumi (or anyone else) or by himself Kintaros can assume Ax Form. In this form the DenGasher forms an ax for short ranged attacks. Ax form gains increased punching power and defense but loses speed and kicking power. This form is Den-O's physically strongest base form due to Kintaros' own brute strength. Kintaros tends to fight as Den-O whenever he senses crying or when hears anything similar to the Japanese word for cry (naku). The aura armor is golden yellow and the motif is of an axe, with a DenKamen Mask resembling the kanji for gold. All of which are elements to the story of Kintaro.

Gun Form

Gun Form

"Gun Form!"
―Transformation announcement[src]
  • Height: 197 cm[3]
  • Weight: 98 kg[3]
  • Punching power: 6 t[3]
  • Kicking power: 10 t[3]
  • Maximum jump height: 42 m[3]
  • Maximum running speed: 100 m per 4 s[3]

When possessing Natsumi (or anyone else) or by himself, Ryutaros can assume Gun Form. The DenGasher forms a gun for short and long ranged attacks. Gun Form displays an increase in power, speed, and defense easily making it the most superior out of Den-O's four basic Imagin forms. Ryutaros tends to fight at his whim as he overpowers the other Taros and Ryotaro himself. However he tends to cause more collateral damage than the other forms due to his low precision and the high power of his ammunition. Ryutaros incorporates break dancing into his fighting style making his movement somewhat unpredictable. The Aura Armor and DenKamen resemble a dragon, the animal associated with Tatsu no ko Taro.

Natsumikan Arms

SIC Gaim Natsumikan Arms.jpg

"Soiya! Natsumikan Arms!"
―Transformation announcement[src]
  • Height: 175 cm
  • Weight: 60 kg
  • Punching power: 6.7 t
  • Kicking power: 10.2 t
  • Maximum jump height: 28 m
  • Maximum running speed: 100 m per 5.9 seconds

In a S.I.C. HERO SAGA story, Natsumi travels to the World of Gaim and gets a blank Sengoku Driver with a Natsumikan Lockseed. She later used them to transform into Kamen Rider Gaim Natsumikan Arms (仮面ライダー鎧武ナツミカンアームス, Kamen Raidā Gaimu Natsumikan Amusu). This version of Gaim has a different helmet and crest from the original Gaim.

In this form, she is armed with the Musou Saber and Daidaimaru.




Imagin Possessions

Rider Card

KamenRide: Kiva-la

KamenRide: Kiva-la (カメンライドキバーラ, Kamenraido Kibāra): A Rider Card containing the power of Kamen Rider Kiva-la.

Behind the scenes


Natsumi Hikari was portrayed by Kanna Mori (森 カンナ, Mori Kanna). As Kamen Rider Kiva-la, her suit actor was Yuuki Ono (小野 友紀 , Ono Yuuki).


A recurring running gag in the series when Natsumi heard something is not really right or getting into some troublesome actions by someone else will cause Natsumi fustrated and performing the Laughter Point into the side of their necks with a thumb. This meme is also appeared in Kamen Rider Decade: Final Chapter, where she used the technique at the Shocker combatant.


An unused Kiva-la suit shows different details.

  • Originally Kamen Rider Kiva-la was going to be the true form of Kiva-la, as shown in the original trailer for Kamen Rider × Kamen Rider W & Decade: Movie War 2010 attached to the finale.
    • This version of Kiva-la originally featured a white belt, had a forehead crest painted solid purple rather than silver and gold, and lacked the black paint and yellow gem on her abdomen.
  • It is unknown how Natsumi can transform into Kamen Rider Kiva-la since she isn't a Fangire herself and it is fatal for humans to even transform into Kiva, dying from use afterward.
    • However, since Kiva-la comes from an alternate world that has differences from the original series, she most likely doesn't have this restriction, meaning humans can transform with her.
  • Her version of Kamen Rider Gaim as seen in the S.I.C. Hero Saga can be considered to be the A.R. World counterpart of the original Gaim.
    • Her version of Gaim also takes inspiration from Kiva-la's design, with a bat-shaped crest along with armor pieces resembling those of Kiva-la's.
      • Additionally, as a Natsumikan is a Hybrid fruit (between an Orange and Pomelo), it's appropriate that the form created by it is a Hybrid of Kiva-la and Gaim's Designs.



Icon-decade.png Kamen Rider Decade
Kamen Riders
Primary: Tsukasa Kadoya - Daiki Kaito - Natsumi Hikari
A.R. Kamen Riders: Wataru Kurenai - Yusuke Onodera - Wataru - Shinji Tatsumi - Kazuma Kendate - Takumi Ogami - Shouichi Ashikawa - Momotaros - Ryotaro Nogami - Sohji - Asumu - Kohtaro Minami (Black RX) - Kohtaro Minami (Black) - X-Rider (A.R. World) - Daisuke Yamamoto - Kazuma Kenzaki - Joji Yuki - Yuriko Misaki
A.R. Evil Kamen Riders: Chinomanako - Mimihiko - Kuchihiko - Kamen Rider Abyss - Dark Kiva - Ryuga - Orga - Dark Kabuto - Alternative
Other A.R. World Riders: Ren Haguro - Scissors - Zolda - Femme - Verde - Tiger - Imperer - Odin - Raia - Gai - Sakuya Hishigata - Mutsuki Kuroba - Takahiro Furuya - Kotaro Nogami - Arata - Ibuki - Zanki - Todoroki - Akira - Junichi Kaito - Haruka Miwa - Shin Magaki - X - Ixa - Saga
Prime Universe Kamen Riders: Kotaro Nogami - Urataros - Kintaros - Ryutaros - Sieg
Drivers: (Neo) Decadriver - (Neo) Diendriver - Kiva-la
Transformation Gear: Rider Cards - K-Touch - Card Holder - Diend Belt
Weapons: Ride Booker - Final Form Rides - Kiva-la Saber
Vehicles: Machine Decader - Machine Diender
Hikari Studio
Natsumi Hikari - Kiva-la - Eijiro Hikari
Other Allies
Ai Yashiro - Kivat-bat the 3rd - Garulu - Basshaa - Dogga - Reiko Momoi - Ai - Mai - Mi - Yuri Tomoda - Toko Yashiro - Deneb - Teddy - Kohana - Naomi - Owner - Toki - Yu - Grandma - Mayu - Natsumi Hikari - Chinatsu - Hikoma KusakabeIcon-crosswiki.png - KurokoIcon-crosswiki.png - Kurando TaniIcon-crosswiki.png - ShinkengersIcon-crosswiki.png - Masahiko Okamura (A.R. World) - Ritsuko Okamura (A.R. World)
Dr. Shinigami - Jigoku Taishi - Apollogeist - Jyumenki Yum Cimil - Shadow Moon - Kingdark - General Jark - Bishum - Yuki - Shvarian - Televi Bae-Kun
Worlds of Black & Black RX: Scorpion Imagin - Seamoon Fangire - Mantis Fangire - Rhinoceros Mutant - Ox Orphnoch - Worm Orphnoch - Frilled Lizard Orphnoch - Brachypelma Worm Aurantium - Brachypelma Worm Viridis - Tarantes Worm Purpura
World of Decade: Siomaneking - Ganikoumoru - Doras - Garai - Me·Vagis·Ba - Xu·Mevio·Da - Me·Ginoga·De - Go·Gadol·Ba - Leiurus Acutia - Formica Regia - Formica Pedes - Sheerghosts - Raydragoons - Psycorogue - Butterfly Orphnoch - Giraffe Orphnoch - Longhorn Orphnoch - Slug Orphnoch - Wild Boar Orphnoch - Pelican Orphnoch - Stinkbug Orphnoch - Arch Orphnoch - Elephant Undead - Giraffa Undead - Darkroachi - Kappa - Bakeneko - Hitotsumi - Coleoptera Worm Aeneus - Coleoptera Worm Croceus - Coleoptera Worm Argentum - Geophilid Worm - Subst Worm - Cassis Worm Gladius - Albinoleo Imagin - Mole Imagin - Rat Fangire - Sungazer Fangire - Bat Fangire
World of Amazon: Go·Jalaji·Da - Propheta Cruentus - Camponotus Worm Maxilla - Bakeneko - Yobuko
Dai-Shocker Combatmen - Dai-Shocker Scientists - Destron Combatmen
Super Shocker
Narutaki - Wasp Woman - Neo Organism
Zanjioh - Jaguarman - Beaded Lizard Man - Hilchameleon - Xu·Goma·Gu - Go·Jalaji·Da - Volucris Falco - Solospider - Scorpion Orphnoch - Titan Undead - Kodama - Sectio Worm Acuere - Cobra Imagin - Gecko Imagin - Sungazer Fangire
Super Shocker Combatmen
World of Kuuga: Me·Garido·Gi - La·Doldo·Gu - Go·Babel·Da - Go·Bemiu·Gi - Me·Byran·Gi - Go·Jaaza·Gi - Me·Garima·Ba
World of Agito: Me·Vagis·Ba - Xu·Mevio·Da - Me·Ginoga·De
The Lords
Taurus Ballista
Formica Regia - Formica Pedes
Mirror Monsters
The Contract Monsters
World of Ryuki: Darkwing - Volcancer - Destwilder - Gigazelle - Abyssodon (Abysshammer - Abysslasher)
World of Negatives: Dragblacker
Wild Mirror Monsters
World of Ryuki: GuldThunder - Zebraskull Bronze - Megazelle - Negazelle - Omegazelle - Magazelle
World of Den-O: Gelnewt
World of Negatives: Raydragoons
Orphnochs / Lucky Clover
Momose - Shukawa - Genda - Shirogane
Butterfly Orphnoch
The Undead
World of Blade: Kamata - Hajime Shijo
Buffalo Undead - Elephant Undead - Capricorn Undead
World of Diend: Fourteen - Bossroach - Darkroachi
World of the Rider War: Deer Undead - Scarab Undead - Lizard Undead
魔化魍 Makamou
Gyuki - Bakegani
Kappa - Bakeneko - Ooari - Tengu - Ubume
Sou Otogiri
Coleoptera Worm Argentum - Geophilid Worm - Subst Worm
The Imagin
Alligator Imagin - New Mole Imagin
The Fangires
Beetle Fangire - Yuki
World of Kiva: Ryo Itoya - Swallowtail Fangire - Lion Fangire
World of the Rider War: Shark Fangire - Silkmoth Fangire - Horsefly Fangire - Warthog Fangire