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Icon-exaid.png This article is about a monster in Kamen Rider Ex-Aid.

"I am the great Kaiden, of the thirtieth standing!"
―Kaiden's Ready to Fight[src]

"My strength is waning...I shall retreat to the shadows, for the time being!"
―Kaiden retreating[src]

Kaiden Bugster (カイデンバグスター, Kaiden Bagusutā) is the monster born from data of the samurai-themed video game, Giri Giri Chambara.

As recorded by CR, Kaiden is part of the Mid Tier of Bugsters within Kamen Rider Chronicle: alongside Vernier, Gatton and Poppy. [The Forbidden Continue!?]



Kaiden is the boss of the Genm Corp. game Giri Giri Chambara, conceived by Kuroto Dan. As a Bugster, Kaiden's origin is traced to the Y2K bug, which left what would be known as the Bugster Virus on the younger Dan's computer shortly following New Year's 2000. Secretly incubating the virus by infecting the young Emu Hojo with it, Kuroto Dan would arrange for its matured form to be extracted by Michihiko Zaizen ten years later.

Initial Emergence

Over five years after Zero Day, the Kaiden Bugster emerged from Detective Heiji Uesugi due to his stress at not being able to solve the case of Zero Day, which had caused the death of his son. Kaiden duels Brave Hunter Quest Gamer Level 5 Full Dragon and Ex-Aid Double Action Gamer Level X in a sword fight, getting weakened by hits Drago Knight and Mighty Double Critical Strikes and retreating back inside of Heiji. He reemerges when Heiji again feels ashamed of his lack of progress on the case, fighting Brave Level 5 Full Dragon, but this time being defeated by a slash from Drago Knight Critical Strike. His debris are collected by Kuroto with the Gashacon Bugvisor.

Level 40

"I am Kaiden, of the fortieth standing."
―Kaiden Bugster Level 40[src]

Advancing to Level 40, Kaiden emerged from Neironzu band member Shishido alongside Level 20 Motors and Level 40 Gatton. Engaged by Kamen Rider Ex-Aid Double Action Gamer, supported by Shishi RedIcon-crosswiki.png, Kaiden and Gatton quickly fled, leaving Motors to be pacified. Confronted by the Kamen Riders at the Seito Stadium, Kaiden was engaged by Kamen Rider Snipe Simulation Gamer Level 50, who destroyed him with the Bang Bang Critical Fire.

Soon after, however, Kaiden was revived among all component Bugsters through the Gashacon Bugvisor by Parado as Kamen Rider Chronicle commenced.

Kamen Rider Chronicle

"Impudent child! Your slashes don't scratch me!"
"The game is already over."
―Kaiden, seemingly unaffected by Ex-Aid Muteki Gamer's Hyper Critical Sparking before the damage takes effect[src]

Serving as a boss within the Kamen Rider Chronicle game, Kaiden was defeated by the Ride-Player Nico Saiba, earning her the Gashatrophy of Giri Giri Chambara.


Kaiden as channeled by Gamedeus.

"En garde!"
―Gamedeus channels Kaiden[src]

As one of the component Bugsters of Kamen Rider Chronicle, Kaiden's power was channeled by the last boss Gamedeus, allowing him to skillfully slash his opponents as performed during his battle against Ex-Aid Muteki Gamer and Para-DX Perfect Knock Out Gamer.

Kaiden was one of four Bugster bosses that were summoned against the Kamen Riders by Masamune Dan once he became Super Gamedeus. They were eliminated with Gamedeus' virus by the vaccine spread through Doctor Mighty XX by Poppy Pipopapo's sacrifice.

Other Events

Kamen Sentai Gorider

Kaiden was part of an perpetually reviving army of Bugsters which emerged in the real world as a result of Kuroto Dan's plot to revive in the Game World. This endless horde was held off by Kamen Riders Brave and Snipe, sharing the Gashat Gear Dual β and Hunter Gamer between each other, while Emu Hojo was sent from CR to the Game World to stop Dan. Ultimately, the Bugster horde was suddenly dissipated in an instant as the destruction of the Game World brought about by Kazuma Kenzaki thwarted Dan's ambition to revive.


Kaiden acts like a highly skilled and well-seasoned samurai, challenging his opponents to sword duels while touting his own skill.


Bugster Virus bacterium.

The Bugsters originate as the microscopic Bugster Virus (バグスターウイルス, Bagusutā Uirusu), a result of humans being contaminated by the Bugster, thus developing the condition known as the Game Disease (ゲーム病, Gēmu-byō).

Kaiden Bugster

Level 30 (レベル30, Reberu Sātī): Kaiden's main form. Like other Level 30 Bugsters, it overtakes the host's form when they become stressed enough.

Powers and Abilities
Swordsmanship Proficiency
As a boss character of Giri Giri Chambara, Kaiden possess tremendous skill in swordsmanship. His usage of Kaiden Sword-Pair implies him to be a practitioner of nitoryū.
Kaiden Sword-Pair (カイデンスウォード・双, Kaiden Sōdo Sō)
A pair of katana utilized by Kaiden. When any Collabos Bugsters utilized the power of Giri Giri Chambara, one of the Kaiden Sword is inherited to them as Collabo Sword.

Appearances: Ex-Aid Episodes 21

Kaiden Bugster Level 40

Level 40 (レベル40, Reberu Fōtī)

Appearances: Ex-Aid Episodes 24

Kaiden Bugster Level 60

Level 60 (レベル60, Reberu Shikussutī)

Appearances: Ex-Aid Episodes 37

Behind the Scenes


Kaiden Bugster is voiced by Otoya Kawano (かわのおとや Kawano Otoya). His suit actors are Takuma Komori and Shogo Teramoto


"Kaiden" is an abbreviation of "Menkyo Kaiden" (免許皆伝), refers to the permission of education system for semi practitioners of various Japanese classical martial arts and ways.

Concept Art

Kaiden Bugster concept art

Kaiden Bugster was designed by Katsuya Terada (寺田 克也, Terada Katsuya).


  • Being born directly from Giri Giri Chambara, the three Bugsters that use the Giri Giri Chambara Rider Gashat receive their katana and chest armor from this Bugster. Unlike Kaiden, their capes were colored silver instead of red.
  • Kaiden Bugster has an oni face design on his hat just like the oni faces on the Hibiki Riders' helmets.


See Also



Icon-exaid.png Kamen Rider Ex-Aid
Kamen Riders
Emu Hojo - Hiiro Kagami (Game World) - Taiga Hanaya - Kiriya Kujo - Kuroto Dan - Parado - Asuna Karino/Poppy Pipopapo - Masamune Dan - Ride-Players (Nico Saiba - Haima Kagami) - Genm (Bakusou Treasure) - Kagenari Nagumo - Ninja-Player - Black Parado
Game Scope - Gamer Driver - Kimewaza Slot Holder - Rider Gashat - Energy Items - Buggle Driver (II) - Bugster Buckle - Gashat Gear Dual (β - Another) - Rider Gauges - Rider Gashat Case - Energy Item Holder
Gashacon Weapons
Gashacon Breaker - Gashacon Sword - Gashacon Magnum - Gashacon Sparrow - Gashacon Bugvisor (II - G) - Gashacon Key Slasher - Gashacon Parabragun
Other Weapons
Flamber Saber - Ride Weapon - Fuma Sōzantō - Genin Weapon
Robot Gamer - Beat Gamer - Combat Gamer - Chambara Gamer - Sports Gamer - Hunter Gamer - Bike Gamer - Burger Gamer - Fantasy Gamer - Simulation Gamer - Maximum Gamer - Safari Gamer - Tank Gamer - Legacy Gamer - Pac Gamer - Famista Gamer - Xevious Gamer - Galaxian Gamer
Asuna Karino - Haima Kagami - Kyotaro Hinata - Ginko Yumita - Nico Saiba - Satsuki Ogimachi - Mizuki Nishikikoji - Tsukuru Koboshi
Others: Saki Momose - Sakurako Dan - Eight Kirino - Saiko Yaotome
Locations: Seito University Hospital - CR - Ministry of Health - Hanaya Game Illness Clinic - Genm Corp. - Game World - Machina Vision - Next Genome Institute
Generals: Parado - Graphite - Ren Amagasaki - Gamedeus
Movie-exclusive: Michihiko Zaizen - Pac-Man Virus - Hatena Bugster - Soji Kuruse - Kazushige Ryuzaki - Ageha Takeda - Johnny Makishima - Nebula Bugster
Stageshow-exlusive: Futago Bugster
Regular Bugsters: Bugster Virus - Bugster Union - Salty Bugster - Aranbura Bugster - Revol Bugster - Motors Bugster - Collabos Bugsters (Gekitotsu - DoReMiFa - Giri Giri - Jet - Kamen Rider Genm series) - Burgermon Bugster - Gatton Bugster - Vernier Bugster - Kaiden Bugster - Charlie Bugster
Regular Games: Mighty Action X - Taddle Quest - Bang Bang Shooting - Bakusou Bike - Gekitotsu Robots - DoReMiFa Beat - Giri Giri Chambara - Jet Combat - Shakariki Sports - Drago Knight Hunter Z - Dangerous Zombie - Mighty Brothers XX - Perfect Puzzle - Knock Out Fighter - Perfect Knock Out - Ju Ju Burger - Night of Safari - Bang Bang Tank - Taddle Fantasy - Bang Bang Simulations - Taddle Legacy - Maximum Mighty X - Kamen Rider Chronicle - Toki Meki Crisis - Hyper Muteki - Doctor Mighty XX - Mighty Creator VRX - Hurricane Ninja - God Maximum Mighty X - Knock Out Fighter 2 - Zombie Chronicle - Mighty Novel X - Genm Musou
Legend Rider Games: Let's Go Ichi Gou! - Adventure Guy Kuuga - Agito of the Sun - Mirror Labyrinth Ryuki - Moshi Moshi Faiz - King of Poker Blade - Taiko Master Hibiki - Insect Wars Kabuto - Time Express Den-O - DokiDoki Makai Castle Kiva - Barcode Warrior Decade - Detective Double - Jungle OOO - Space Galaxy Fourze - Magic The Wizard - Toukenden Gaim - Full Throttle Drive - Kaigan Ghost - Kamen Rider Build - Ganbarizing
Legend Games: Pac Adventure - Famista - Xevious - Taiko no Tatsujin - Galaxian
Other Games: Hatesate Puzzle - Buddhist Priest of Temple - Chou Super Hero Taisen - Chou Shocker Taisen - Bakusou Treasure - WayoseTUNE - Nazo Toki Labyrinth