This article is about a/an ranger in Ninja Sentai Kakuranger.

"NinjaYellow! Seikai!"
―NinjaYellow's roll call[src]

Seikai (セイカイ Seikai) is NinjaYellow (ニンジャイエロー Ninja Ierō) of the Kakurangers. He is 24 years old (41 in Gokaiger) and a descendant of Seikai Miyoshi.



Seikai first encountered the Youkai when a friend of his was kidnapped by Rokurokubi, who thought he was her deceased son. Seikai fled with his friend and was rescued by Tsuruhime, Sasuke, and Saizou. They brought him to where his ancestor's sword was placed in the Earth. Upon pulling out his sword, the spirit of Seikai's ancestor appeared before him, gave him a lecture, and entrusted him with a Doron Changer, allowing Seikai to become NinjaYellow. Ep. 2: A Dangerous Lady The four were soon joined by Jiraiya, completing the team. Ep. 3: American Ninja

Super Sentai World

The Kakurangers in Super Sentai World.

When Emperor Daidas and his army invaded Earth, Seikai, alongside his team, joined with the four Sentai that came before them, the Dairangers, Zyurangers, Jetmen, and Fivemen, to defeat him. Super Sentai World

Toei Hero Daishugō

The Dairangers with Kakurangers in Toei Hero Daishugō.

The Kakurangers and Dairangers standing alongside each other on the other side. Toei Hero Daishugō

Ole vs. Kakuranger

Kakuranger in Ohranger.

to be added Chouriki Sentai Ohranger: Ole vs. Kakuranger

Gaoranger vs. Super Sentai

NinjaYellow is among the Sentai warriors seen in clips when Gouki (GingaBlue) lectured Soutarou Ushigome (GaoBlack) about the past Sentai strong warriors, humbly claiming to not be nearly as strong as they are. Hyakujuu Sentai Gaoranger vs. Super Sentai


Legend War

The Kakurangers fighting alongside the Hurricanegers, Gouraigers and Shurikenger in the Legend War.

Years later, Seikai fought alongside not only his own team, but every single Sentai ranger in existance, against the Empire of Zangyack when it attacked the Earth in the Great Legend War. After fighting against hundreds of Gormin and their Zgormin commanders. Kaijou noticed the fleet moving towards them, he gathered all the Rangers together and gave them the order to sacrifice their powers to wipe out the first invasion's armada. The NinjaYellow powers are later used by Luka Millfy via the Ranger Keys. Ep. 1: The Space Pirates Appear Gokaiger Goseiger Super Sentai 199 Hero Great Battle

Farewell Space Pirates

After the Zangyack's final defeat, Marvelous returned the Ranger keys to their original owners. It is assumed Seikai, Tsuruhime and their teammates have their powers once again and will work alongside Ninjaman to cut down evil in the shadows once more. Final Ep.: Farewell Space Pirates

Super Hero Taisen

The Kakurangers, alongside the Carrangers, Zyurangers, Dairangers and Ohrangers, emerge through a dimensional wall.

Seikai, alongside his team (bar Ninjaman), among the majority of the Super Sentai heroes, was caught up in the "Super Hero Taisen" incident which eventually resulted in the Super Sentai teams and Kamen Riders joining forces to defeat both Dai-Zangyack and Dai-Shocker. Kamen Rider × Super Sentai: Super Hero Taisen

Zyuohger vs. Ninninger

The first 38 Sentai projected into Wild Tousai Shuriken King.

NinjaYellow appeared with his team among the first 38 Super Sentai whom collectively empowered Wild Tousai Shuriken King in its fight against the titanic Gillmarda, granting the Ninningers and Zyuohgers the power to perform the Zyuoh Ninnin Super Sentai Burst which destroyed Gillmarda with the combined power of all 40 Super Sentai. Doubutsu Sentai Zyuohger vs. Ninninger: Message from the Future from Super Sentai

Super Sentai Strongest Battle

Seikai joined the Super Sentai Strongest Battle as a member of Big Eater Team. It’s unknown whether he participated in the match, but his team was eliminated after losing the first round against the Gilded Team.


Seikai likes video games. He is driven by desire for food, sleep, and especially women. While all the Kakurangers seek to impress Tsuruhime, Seikai in particular expresses the greatest admiration for her, often putting himself in great danger to protect or save her. He is indecisive, but has unusual strength inherited from his ancestor. He corresponds to Zhu Bajie/Cho Hakkai.

Video game appearances

Super Sentai Battle: Dice-O

NinjaYellow as depicted in Super Sentai Battle: Dice-O.

  • Profile
Seikai/NinjaYellow: to be added

Super Sentai Battle Base

NinjaYellow is among the vast pantheon of Rangers which are available in the mobile game Super Sentai Battle Base.

Super Sentai Legend Wars

NinjaYellow Card

NinjaYellow appears with his team among all Sentai in the mobile game Super Sentai Legend Wars.






  • Hidden Style: Triple Slash: NinjaYellow's signature sword technique, a triple energized slash in the formation of a triangle.
  • Art of the Giant Illusion: NinjaYellow creates a giant illusion of himself to attack his opponents.
  • Hidden Style: Whirlwind:where NinjaYellow used his sword to shoot a yellow tornado towards the enemy.
  • Echo Art
  • Leaf Hiding Art

Appearances: Kakuranger Episodes 2-25, 27, 29-53

Giant Beast General Yellow Kumard (巨大獣将イエロークマード Kyodai Jūshō Ierō Kumādo): NinjaYellow's Juushou form, armed with the Kumard Claw, with which he can entangle and grab enemies. It can perform the 'Kakureryuu Ninpo Kaen Rin' (Hidden Style Ninja Magic Flaming Ring), a hoop of fire. Forms Muteki Shogun's right leg. Its name is a pun on the Japanese word for bear ( kuma).

Beast General Fighter Battle Kumard (バトルクマード Batoru Kumādo): Ninja Yellow's Juushou Fighter form, armed with the Kumard Head (クマードヘッド Kumādo Heddo).

Ranger Key

The NinjaYellow Ranger Key.

The NinjaYellow Ranger Key (ニンジャイエローレンジャーキー Ninja Ierō Renjā Kī) is Seikai's personal Ranger Key and what became of his powers after he along with the rest of the 34 Super Sentai sacrificed their powers to end the Great Legend War.

This key along with the majority of the Ranger Keys were collected by the Red Pirates and later used by the Gokaigers. The NinjaYellow Ranger Key was mainly used by Luka Millfy (Gokai Yellow), who used it to fight as NinjaYellow.

The Kakuranger keys, along with all the Ranger Keys of the first 33 Super Sentai, were briefly taken by the Black Cross King and turned into Ranger puppets that were fought by the Gokaigers and the Goseigers. The Kakuranger keys were defeated by Gokai Green. Gokaiger Goseiger Super Sentai 199 Hero Great Battle

After Zangyack were finally defeated, the Gokaigers gave the Ranger Keys back to their rightful owners. Seikai received his key and became NinjaYellow once more. Final Ep.: Farewell Space Pirates


Behind the Scenes


NinjaYellow as seen in a Kakuranger pre-break eyecatch.

Seikai is portrayed by Shu Kawai (河合 秀 Kawai Shū). As NinjaYellow, his suit actor was Hirofumi Ishigaki (石垣 広文 Ishigaki Hirofumi).



See Also

External links

Yellow Rangers
Yumeria Moegi

Secondary Rangers
EAGLE agentDeathdark YellowGinga YellowShadow Yellow OwlGolemPrevious KirinRanger
Copy KirinRangerKazu's grandsonZokuYellowNeziYellowCopy TimeYellowCopyYellow
Shade GaoYellowSargainFake HurricaneYellowTensaikikkuMugiEvil MagiYellow
Evil Bouken YellowWater Pollution Minister KegalesiaYoko

Power Sets
KirengerDenziYellowVulPantherGoggleYellowDynaYellowYellow4Yellow FlashYellow Mask
Yellow LionYellow TurboFiveYellowYellow OwlTigerRangerKirinRangerNinjaYellow
OhYellowYellow RacerMegaYellowGingaYellowGoYellowTimeYellowGaoYellowHurricaneYellow
AbareYellowDekaYellowMagiYellowBouken YellowGekiYellowGo-On YellowShinken Yellow
Gosei YellowGokai YellowYellow BusterYellow RabbitToQ 3gouKiNingerZyuoh LionKajiki YellowLupinYellowKirama Yellow

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