This article is about a/an character in Kamen Rider Ryuki.

Hideyuki Kagawa (香川 英行 Kagawa Hideyuki) is 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.

S.I.C. Hero Saga

Hideyuki appears in S.I.C. Hero Saga which is Kamen Rider Ryuki: World of If.

Yui is seeking out her brother when she is confronted by Alternative Zero and 12 Alternatives. Alternative Zero recognizes her as the unwilling cause of the war, and tries to kill her, but Shinji sacrifices himself to save her. Alternative Zero can’t believe a Rider would act selflessly and Yui asks him for something. Kamen Rider Ryuki: World of If

Kamen Rider Wizard


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

Rider Statistics

KRDK-advent master

Kamen Rider Alternative Zero

Rider Statistics

  • Height: 190cm
  • Weight: 93kg

Ability Perimeters:

  • Punching Power: 15t (AP: 300)
  • Kicking Power: 22.5t (AP: 450)
  • Maximum Jump Height: 50m
  • Maximum Running Speed: 100m per 4.5 seconds
  • Sight: 20km
  • Hearing: 15km

Appearances: Ryuki Episodes 39-42

Contract Monster



Main article: Psycorogue

The Alternatives' sole contract monster, Psycorogue, resembling a humanoid cricket, had the ability to transform into a motorcycle named Psycoroader through the use of the Wheel Vent Advent Card and during the Alternatives' Final Vent Dead End. This Mirror Monster had an opposite color scheme to its corresponding Rider, having white armor with black accents. Its name is a portmanteau of the two words, psycho and koorogi, which is Japanese for "cricket".

Advent Cards

Because they were designed by Kagawa and not Shiro Kanzaki, the Alternatives' Advent Cards differ from the ones used by the Kamen Riders. The terminals and images are printed crosswise, having the inscription Alternative Advent Card Alchemy System at the back. Also, there are green characters on the cards, which may give information to the Visor on what kind of card is swiped.

Slash Visor: The Alternative system's card reader is mounted on the wielder's right forearm, with a female voice unlike the male voice used by the Kamen Riders's Visors. Unlike the regular Visors, the Alternatives swiped their Advent Cards across their Visors (much like the Rouzers used in Kamen Rider Blade), which burned up with jet-black flame and disappeared at the card's scanning.

  • Advent (AP: 6500): Summons Psycorogue.
  • Sword Vent (AP: 2000): Conjures the Slash Dagger.
  • Accele Vent (AP: 2500): Increases the wielder's movement speed.
  • Wheel Vent (AP: 4500): Transforms Psycorogue into Psycoroader.
  • Final Vent (AP: 8000): Executes Dead End. While riding Psycoroader, the wielder spins out faster and faster until the bike is rammed into the opponent. Only Alternative Zero performed his Final Vent - the regular Alternative died before he could perform it.

Picture Gallery

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 thing, leads to his betrayal and death at the hands of his own student.

See Also