Icon-ryuuki.png This article is about a/an character in Kamen Rider Ryuki.

For the A.R. World version, see Tanaka.
For Alternative, see Hajime Nakamura.
"Sacrificing one life to save ten. That is the meaning of a true hero."
―Kagawa's philosophy[src]

Hideyuki Kagawa (香川 英行 Kagawa Hideyuki) was the real identity of Alternative Zero (オルタナティブ・ゼロ Orutanatibu Zero), an imitation of the 13 Riders.


Prior to Kanzaki's experiment, Kagawa wandered into Room 401 at Seimeiin University one day and happened to see Shiro Kanzaki's notebook lying on the floor. He scooped it up, opened it and gave every intriguing page a once-over glance before Kanzaki snatched it from him. However, Kagawa had photographic memory and remembered what he had read. After learning the severe nature of Kanzaki's experiments, Kagawa began to duplicate Kanzaki's work in order to close the Mirror World. To that end, he formed a relationship with Satoru Tojo and Hajime Nakamura, with Kagawa eventually creating the Alternative decks.

Kagawa was a married man, with a young son named Yuuta. Though he deeply loved both his wife and son, he did not let Kanzaki's threat to their lives deter him from his course to close the Mirror World. Unfortunately, he died for it at the hands of Satoru, who did it based on the man's word that "a hero must sacrifice the one they love". Satoru would come to regret his deed in the name of heroism.

Kamen Rider Wizard

Neverending Story


Alternative wasn't Amadum's monster (only used as a Dark Rider) in the world within the Magic Stone. With the Batta Yummy and Arch Orphnoch, they attacked and defeated Beast when he intruded in Amadum's lair as he planned to harness the Kamen Riders power, forcing Beast to his proper place in space and time. The three monsters later appeared to capture the young Haruto and Koyomi, fighting off Haruto, Rinko, and Shunpei, when they tried to stop them. They brought the children to Amadum as Tsukasa Kadoya gave him the thirteenth and last Rider Ring (Fourze). The Kamen Riders refused to fight Haruto, saying they fought for human freedom and not just justice, engaging Amadum's monsters. Alternative, Batta Yummy and Arch Orphnoch, along with several other monsters, were destroyed by Wizard and Decade. Neverending Story

Alternative Zero

Alternative Zero

Alternative Zero

Rider Statistics

  • Rider Height: 195 cm.[1]
  • Rider Weight: 98 kg.[1]

Rider Senses:

  • Eyesight: 20 km.[1]
  • Hearing: 15 km.[1]

Ability Parameters:

  • Punching Power: 15 t.[note 1]
  • Kicking Power: 22.5 t.[note 2]
  • Maximum Jump Height: 50 m.[1]
  • Maximum Running Speed: 100 m. per 4.5 sec.[1]

Special Attacks:

Kagawa transforms into Alternative Zero using his version of the Card Deck and V Buckle. Alternative Zero is the prototype model of Alternative, a mimicry of the 13 Riders created by Kagawa using Shiro Kanzaki's notes on the Mirror World. The completed version of Alternative is used by Hajime Nakamura. Both versions are identical with the exception of the color of the tubes on the shoulders and Alternative Zero being shorter and lighter. Although it is unclear if the two are contracted in the same way as the 13 Riders and their Contract Monsters, the Mirror Monster Psyco-Rogue can be summoned by Alternative Zero and follows his commands. Alternative Zero's Visor, the Slashvisor, is a gauntlet mounted on his right arm.

Through the use of his Sword Vent, Alternative Zero can arm himself with the Slashdagger (スラッシュダッガー Surasshu Daggā), a sword derived from Psyco-Rogue's forearms. By using the Wheel Vent, Alternative Zero can transform Psyco-Rogue into motorcycle mode named the Psycoroader (サイコローダー Saikorōdā) for him to ride.

By using his Final Vent, Alternative Zero can execute his finisher, the Dead End (デッドエンド Deddo Endo), which transforms Psyco-Rogue into the Psycoroader if it has not done so already. Alternative Zero then rides the Psycoroader toward the opponent and rams into it.

Appearances: Ryuki Episodes 39-42 , Wizard Episode 53.

Contract Monster


  • Card Deck - Transformation device and Advent Card holder
  • V Buckle - Transformation belt
  • Advent Cards - Trinkets that enable a Rider to summon Contract Monsters, access equipment, and use special abilities
  • Slashvisor - Alternative Zero's Visor that enables him to use Advent Cards


Behind the scenes


Hideyuki Kagawa is portrayed by Satoshi Jinbo (神保 悟志 Jinbo Satoshi). As Alternative Zero, his suit actor was Yoshifumi Oshikawa (押川 善文 Oshikawa Yoshifumi).


  • Much like the 13 Mirror Riders, Kagawa also died an ironic death: His teachings about "sacrificing one life for ten" for the sake of heroism, even though he can't bring himself to do such a thing, leads to his betrayal and death at the hands of his own student.



  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 TV Asahi. (2002). Pseudo Rider.
  2. Shogakukan. (2003). Masked Rider Ryuki: Complete Works. Second Volume. p. 42. ISBN 978-4091014856.
  3. Kamen Rider Official Data/Perfect File.
  4. Kodansha. (2015). Kamen Rider Official Mook. Heisei Vol. 03. p. 14. ISBN 978-4063535532.
  5. MediaWorks. (2003). Masked Rider Ryuki: Hybrid File. p. 73. ISBN 978-4840224284.


  1. 300 AP[1], conversion: 1 AP (Ryuki) = 20 t.
  2. 450 AP[1], conversion: 1 AP (Ryuki) = 20 t.
  3. 2000 AP[1], conversion: 1 AP (Ryuki) = 20 t.
  4. 2500 AP[1], conversion: 1 AP (Ryuki) = 20 t.
  5. 4500 AP[1], conversion: 1 AP (Ryuki) = 20 t.
  6. 8000 AP[1], conversion: 1 AP (Ryuki) = 20 t.
  7. 6500 AP[2][3][4][5], conversion: 1 AP (Ryuki) = 20 t.

External Links

See Also

Icon-ryuuki.png Kamen Rider Ryuki
The 13 Kamen Riders
Shinji Kido - Ren Akiyama - Masashi Sudo - Shuichi Kitaoka - Miyuki Tezuka - Jun Shibaura - Takeshi Asakura - Satoru Tojo - Mitsuru Sano - Kamen Rider Odin - Goro Yura
Movie/Special Exclusive: Koichi Sakakibara - Itsuro Takamizawa - Miho Kirishima - Dark Shinji
Stageshow Exclusive: Kamen Rider Papillon - Kamen Rider Cerberus
The Alternatives
Hajime Nakamura - Hideyuki Kagawa
Transformation Devices
Card Decks - V Buckle - Advent Cards
Dragvisor - Darkvisor - Scissorsvisor - Magnuvisor - Evilvisor - Metalvisor - Venovisor - Destvisor - Gazellevisor - Biovisor - Blancvisor - Blackdragvisor - Goldvisor - Slashvisor - Abyssvisor
Sword Vents
Ridesaber - Dragsaber - Winglancer - Venosaber - Wingslasher - Goldsabers - Dragsaber (Ryuga) - Abysssaber - Slashdagger
Strike Vents
Dragclaw - Scissorspinch - Gigahorn - Metalhorn - Destclaws - Dragclaw (Ryuga) - Abyssclaw
Guard Vents
Dragshield - Wingwall - Shelldefense - Gigaarmor Wingshield - Dragshield (Ryuga) - Goldshield
Shoot Vents
Gigacannon - Gigalauncher
Swing Vents
Spin Vents
Hold Vents
Rideshooter - Dragranzer (Bike Mode) - Darkraider (Bike Mode) - Psycoroader
Kanzaki family
Yui Kanzaki - Shiro Kanzaki - Sanako Kanzaki
ORE Journal
Daisuke Okubo - Reiko Momoi - Nanako Shimada - Megumi Asano
Mirror Monsters
The Contract Monsters: Dragreder - Darkwing - Volcancer - Magnugiga - Evildiver - Metalgelas - Venosnaker - Genocider - Destwilder - Gigazelle (Contract Monster) - Goldphoenix - Biogreeza - Blancwing - Dragblacker - Psyco-Rogue
Wild Mirror Monsters: Spiders (Dispider - Mispider - Respider - Solospider) - Zelles (Gigazelle - Megazelle - Magazelle - Negazelle - Omegazelle) - Zebraskulls (Iron - Bronze) - Boarders (Wildboarder - Shieldboarder) - Biters (Zenobiter - Terabiter) - Krakens (Bakraken - Wiskraken) - Gulds (GuldThunder - GuldStorm - GuldMirage) - Abyss (Abysshammer - Abysslasher - Abyssodon) - Buzzstingers (Hornet - Bee - Wasp - Frost - Broom) - Sheerghosts (Sheerghost - Raydragoon - Hydragoon) - Deadlemur - Gelnewt - Sonorabuma - Brobajell - Fake Kamen Rider Agito
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