Icon-bioman.png This article is about a/an ranger in Choudenshi Bioman.

―Yellow4's roll call[src]

Jun Yabuki (矢吹 ジュン Yabuki Jun) became the second Yellow4 (2代目イエローフォー Nidaime Ierō Fō) of the Biomen. She is an Olympic archer, who after watching the Bioman in action, tries to join them but is initially refused, even though Mika Koizumi had just died.



The others were looking for another descendant of the original five who were bombarded with the Bio Particles. However, Jun proves her courage, and it was also a pleasant surprise to discover that she has Bio Particles. It was thus with great joy that she was presented with a Bio Changer to become the new Yellow Four. She has to sacrifice her membership in the Japanese Olympic Archery Team, yet her skills become valuable to the Biomen.

In Episode 35 during their mission to find the mountain side where Mason and his squad are making explosions to collect magnetic rocks, she's the only person who takes down Shota Yamamori when she encounters him with her group for the second time. When her group takes to his home at Mt. Nekura, it reveals that Shota has feelings towards her which she remarks that he was admirable. When Shota was attacked by Mason, she as Yellow4 attempts to hit Mason with her Thunder Sword but dodges as Mason teleported. She was later relieved to see Shota was alive after surviving Mason's attack. In Episode 36, this deals their relationship. Jun tells him that he shouldn't get involved with their mission which Shota replies that he loves to take on danger places. Jun became dismayed towards him stating that he does not understand, he was a good person but he cannot join the team much to Shota's horrible shock and Jun angrily tells him not to argue and he has to go home as she leaves to join to her group causing Shota to be angrily desperate.

After Farrah reveals to the Biomen that Magne Warrior is Shota which Jun as Yellow4 was shocked as everyone got attacked by Magne Warrior's eye beam as they fall into the edge separately. As everyone reverted to their normal state as Shingo stated about people being exposed with magnetic energy. Jun realizes it was her fault for making Shota left behind as she set out alone to free him from being brainwashed leaving her group from behind.

As Jun confronts Shota as Magne Warrior, both had a fight as Magne Warrior manages to injure her left arm and Shirou and his group discovers Jun's feelings towards him and Jun notices that Shota's brainwashing was wearing off and she saw two bracelets that Shota was wearing as Magne Megas which is piloted by Farrah attempts to recharge his magnetic energy. Jun manages to destroy the bracelets with her two of her arrow shots from her bow and Shota was freed from brainwashing. After Shota was freed from brainwashing, he and Jun are fighting the mechaclones with their bow and arrows until Psygorn hits them with fireballs. After Red1 and the Biomen saved her, Shota decides to infiltrate the magnetic base alone as Jun gives her bow to him before transforming into Yellow4 to join the fray.

After Magne Megas was defeated, she and her group visit Shota's home at Mt. Nekura where Shota is seen in a white suit while fixing his home with his and Jun's names imprinted on it which he decides to marry Jun as her bride and living together as a married couple and making love as their honeymoon causing Jun to flee with his group as Shota watches as he gives a farewell to Jun.


Bioman come to cheer on the Turborangers.

Jun and her team joined up with the other nine Sentai to stand behind the newest Sentai, the Turborangers, as they faced off against the Hundred Boma Tribes. Tvicon.png TV STORY-Counting on You! Turboranger

Gaoranger vs. Super Sentai

Yellow4 is among the Sentai warriors seen in clips when Miku Imamura (MegaPink) lectured Sae Taiga (GaoWhite) about the past female Super Sentai warriors and their shared mastery of disguise and habit of changing their clothing in the blink of an eye, something that Sae had never done before. Tvicon.png TV STORY-Hyakujuu Sentai Gaoranger vs. Super Sentai


Legend War

Years later, Jun fought alongside not only her own team, but every single Sentai ranger in existence, 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 Yellow Four powers are later utilized by Luka Millfy via the Ranger Keys. Tvicon.png TV STORY-Ep. 1: The Space Pirates Appear Tvicon.png TV STORY-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. Jun and her team have their powers again. Tvicon.png TV STORY-Final Ep.: Farewell Space Pirates

Super Hero Taisen

The Biomen, alongside the Flashmen, Changemen, Dynamen, and Turborangers, emerge through a dimensional wall.

Jun, alongside her team, 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. Tvicon.png TV STORY-Kamen Rider × Super Sentai: Super Hero Taisen

Zyuohger vs. Ninninger

The first 38 Sentai projected into Wild Tousai Shuriken King.

Yellow4 appeared with her 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. Tvicon.png TV STORY-Doubutsu Sentai Zyuohger vs. Ninninger: Message from the Future from Super Sentai

Super Sentai Strongest Battle

Jun joined the Super Sentai Strongest Battle as a member of Archer Team, but didn’t get to participate in the competition because her team was eliminated after losing the first round against Swordsman Team.

Stage Show appearances

Bioman Stage Show at Super Hero Korakuen Yuenchi

In a stage show where the Biomen are seen fighting Neo Empire Gear and Bio Hunter Silva, Kamen Rider StrongerIcon-crosswiki.png, ShaiderIcon-crosswiki.png, Kamen MachinemanIcon-crosswiki.png, DynaRed, DynaBlue, GoggleBlack, VulPanther, and DenziGreen arrive to assist the Biomen.

Bioman Stage Show at 3 Heroes Korakuen Yuenchi

In a stage show where the Biomen are seen fighting Neo Empire Gear and Bio Hunter Silva, ShaiderIcon-crosswiki.png and Kamen MachinemanIcon-crosswiki.png arrive to assist the Biomen.

Video game appearances

Super Sentai Battle: Dice-O

Yellow4 as depicted in Super Sentai Battle: Dice-O.

  • Profile
Mika Koizumi/Jun Yabuki/Yellow4: to be added

Super Sentai Battle Base

Yellow4 is among the vast pantheon of Rangers which are available in the mobile game Super Sentai Battle Base.

Super Sentai Legend Wars

Bioman as seen in Super Sentai Legend Wars.

Yellow4 appears with her team among all Sentai in the mobile game Super Sentai Legend Wars.






  • Super Electronic Holography
  • Strobe Flash

Transformation and Roll Call

Ranger Key

The Yellow4 Ranger Key.

Mobilates' Gokai Change announcement[src]

The Yellow4 Ranger Key (イエローフォーレンジャーキー Ierō Fō Renjā Kī) is Jun Yabuki's personal Ranger Key and what became of her powers after she 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 Yellow4 Ranger Key was mainly used by Luka Millfy (Gokai Yellow), who used it to fight as Yellow4.

The Bioman 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. Splitting up, the puppet Yellow4 was defeated as part of a group of surviving Yellow warrior keys by Gokai Yellow and Super Gosei Yellow. Tvicon.png TV STORY-Gokaiger Goseiger Super Sentai 199 Hero Great Battle

After Zangyack were finally defeated, the Gokaigers gave the Ranger Keys back to their rightful owners. Jun received her key and became Yellow4 once more. Tvicon.png TV STORY-Final Ep.: Farewell Space Pirates


  • The first kanji in her surname (Ya) means "Arrow" which is a reference to her profession as an archer.
  • Unlike the other Biomen, when this series was dubbed into English in the Philippines, Jun retained her original Japanese name.
    • She shares this trait with Riki Honoo as he also retained his Japanese name, though his name sounds like the English name of "Ricky".
  • In the Philippine-English dub of the series, Jun was voiced by Dada Carlos; Jun was her first role as a voice actress.

See also


External links

Icon-bioman.png Choudenshi Bioman
Shirou Gou - Shingo Takasugi - Ryuuta Nanbara - Mika Koizumi - Jun Yabuki - Hikaru Katsuragi
Techno Brace - Bio Swords - Bio Arrow - Bio Machines - Bio Turbo
Bio Peace Union:
Peebo - Joy
Other Allies:
Shuichi Kageyama - Professor Shibata - Shota Yamamori - Minor Characters - Turborangers - Gokaigers
Mecha and Robo
BioDragon - BioJet-1 - BioJet-2
Neo Empire Gear
Doctor Man - Mason - Farrah - Farrah Cat - Monster - Mechaclones (Mechaclone No. 1)
Beastnoids: Zyuoh - Messerjū - Psygorn - Mettzler - Aquaiger
Mecha-Gigants: Kabuto Canth - Devil Canth - Gorilla Canth - Beetle Canth - Mummy Canth - Rhino Canth - Sea Anemone Canth - Twin Canth (Twin Dolls) - Chameleon Canth - Samurai Canth - Hammer Canth - Shark Canth - Anchor Canth (Neo Intellect Brain) - Frog Canth - Neptune Canth - Turtle Canth - Haniwa Canth - Grotes Canth (Prince) - Camera Canth - Scarab Canth - Pirahna Canth - Poison Moth Canth - Crab Canth - Ghost Canth - Spider Canth - Octopus Canth - Jellyfish Canth - Mantis Canth
Neo Mecha-Gigants: Metal Megas - Axe Megas - Skull Megas - Wrestler Megas - Magne Megas (Magne Warrior) - Cannon Megas - Battle Megas - Sonic Megas - Crush Megas - Amazon Megas - Thunder Megas - Satan Megas (Miki) - Baroque Megas - Rugger Megas - Lens Megas - Super Megas - King Megas
Anti-Bio Union
Bio Hunter Silva - Balzion
Yellow Rangers

Secondary Rangers
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Copy KirinRangerKazu's grandsonZokuYellowNeziYellowCopy TimeYellowCopyYellow
Shade GaoYellowSargainFake HurricaneYellowTensaikikkuMugiEvil MagiYellow
Evil Bouken YellowWater Pollution Minister KegalesiaYoko

Power Sets
KirengerDenziYellowVulPantherGoggleYellowDynaYellowYellow4Yellow FlashYellow Mask
Yellow LionYellow TurboFiveYellowYellow OwlTigerRangerKirinRangerNinjaYellow
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