This article is about a/an 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, she only used her powers twice.


Prior to the series, Natsumi was a member of the Taigaku Club (or TG Club for short) with a group of friends. 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.

At the start of the series, Natsumi has nightmares about a mysterious Rider know as "Decade" and later discovers his belt and cards in the destruction of her world, giving them to Tsukasa. Knowing the dangers, Natsumi decides to accompany him on his journey anyway.

She occasionally uses the Hikari family's "secret technique", the Laughing Pressure Point, to keep Tsukasa and others in line, causing them to laugh uncontrollably. It's possible she has feelings for Tsukasa, and it is often hinted at during conversations with Yusuke.

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.

World of Shinkenger

In the World of Shinkenger, she assures Tsukasa that the Hikari Family Studio is as much Tsukasa's home as where he came from, as it is the place that he "always returns to". The Arrival of the Samurai Sentai Heretic Rider, Go Forth!

World of Black RX

In the World of RX she puts herself between Apollo Geist and Tsukasa, deflecting Apollo Geists's Perfecter, which was meant to drain the life energy from Tsukasa to prolong Apollo Geist'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. RX! Dai-Shocker Attack Black × Black RX

World of the Rider War

In the World of the Rider War, she is kidnapped by Apollo Geist, 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.Rider War: Prologue Destroyer of Worlds

Movie War 2010


Natsumi's transformation into Kiva-la

In Decade: Final Chapter Natsumi and her grandfather live alone again, after Tsukasa becomes Violent Emotion, Decade begins systematically eliminating all Kamen Riders, Daiki Kaito disappears, and Yusuke Onodera chases after Decade. She tries to convince Decade to stop what he's doing, but fails to make him see things her way. 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 Kamen Ride 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 Super Doctor Shinigami. She is last seen with her friends taking a picture after the conflict, after announcing their intent to continue traveling together.

Video Game Appearances

Kamen Rider Buttobasoul


Kamen Rider Kiva-la Medal

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


Kamen Rider Battle: Ganbarizing

Rider Powers


Kamen Rider Kiva-la

"Here we go! Henshin!"
―Transformation announcement[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 s

Kamen Rider Kiva-la (仮面ライダーキバーラ Kamen Raidā Kibāra) is the new Kamen Rider that appear in Decade: The Last Story. Natsumi transforms into Kamen Rider Kiva-la to stop Decade Violent Emotion's rampage, being described as the only one able to do so. She later transforms to help Decade, Kuuga, and Diend in order to defeat the rest of Super Shocker, as well as rescue her grandfather from the Super Crisis Fortress.

Rod Form
KR-Den-O 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
KR-Den-O 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
KR-Den-O 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
"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 s

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 a Musou Saber and a Daidaimaru (not seen here but mentioned).





  • Den-O Belt - Transformation belt
  • Rider Pass - Train pass used in transformation
  • Combination Armament DenGasher - A weapon used by Den-O that can be manipulable depending on the Imagin. While Urataros in possession, his took the form of Rod Mode (ロッドモード Roddo Mōdo).

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).



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.
  • It is unknown how Natsumi can transform into Kamen Rider Kiva-la since she isn't a Fangire herself and it's fatal for humans to even transform into Kiva, dying from use afterwards.
    • 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.
  • As Kiva-la, she is categorized as a Kiva Rider due her powers being from the Kivat family. But due to her appearance is in Decade, this title isn't used.
  • 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 Pamelo), it's appropriate that the form created by it is a Hybrid of Kiva-la and Gaim's Designs.
  • The "Laughing Pressure Point" that Natsumi performed by using her thumb to striking the necks of hosts that has a weak spot. However, this was really used as an internet meme.


Icon-decade Kamen Rider Decade
Kamen Riders
Primary: Tsukasa Kadoya - Daiki Kaito - Natsumi Hikari (movie only)
A.R. World Heroes: Yusuke Onodera - Wataru - Shinji Tatsumi - Kazuma Kendate - Takumi Ogami - Shouichi Ashikawa - Momotaros - Ryotaro Nogami - Souji - Asumu - Kotaro Minami (Black RX) - Kotaro Minami (Black) - Daisuke Yamamoto - Samurai Sentai Shinkenger - Joji Yuki
A.R. World Evil 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 - G3-X - Kotaro Nogami - Arata - Ibuki - Zanki - Todoroki - Akira - Junichi Kaito - Haruka Miwa - Shin Magaki - X - Ixa - Saga
Prime Universe Kamen Riders: Shun Kageyama - Sou Yaguruma - Masato Kusaka - Takeshi Asakura - Wataru Kurenai - Kazuma Kenzaki - Shouichi Tsugami - Kohtaro Minami - Kotaro Nogami - Shinji Kido - Yuto Sakurai - Dark Shinji - Riotrooper
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 - Urataros - Kintaros - Ryutaros - Sieg - Deneb - Teddy - Kohana - Naomi - Owner - Toki - Yu - Grandma - Mayu - Natsumi Hikari - Chinatsu - Hikoma KusakabeIcon-crosswiki - KurokoIcon-crosswiki - Kurando TaniIcon-crosswiki - Masahiko Okamura (A.R. World) - Ritsuko Okamura (A.R. World)
Doctor Shinigami - Ambassador Hell - Apollo Geist - Ten-Faced Demon Llumu Qhimil - Shadow Moon - King Dark - General Jark - Bishium - Yuki - Schwarian - 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: Shiomaneking - Ganikomol - Doras - Garai - Me-Badjisu-Ba - Zu-Mebio-Da - Me-Ginoga-De - Go-Gadoru-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 - Darkroaches - 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-Jaraji-Da - Propheta Cruentus - Camponotus Worm Maxilla - Bakeneko - Yobuko
Dai-Shocker Combatmen - Dai-Shocker Scientists - Destron Combatmen
Super Shocker
Narutaki - Bee Woman - Neo Organism
Zanjioh - Jaguarman - Poison Lizard Man - Hiruchameleon - Zu-Gooma-Gu - Go-Jaraji-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-Gyarido-Gi - Ra-Dorudo-Gu - Go-Baberu-Da - Go-Bemiu-Gi - Me-Biran-Gi
World of Agito: Me-Badjisu-Ba - Zu-Mebio-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 - Darkroaches
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

Cite error: <ref> tags exist, but no <references/> tag was found
Community content is available under CC-BY-SA unless otherwise noted.