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Kaizo Jingu (神宮 海蔵, Jingū Kaizō), more commonly known as JK (JK, Jeiku, pronounced as Jake), is a supporting character in Kamen Rider Fourze. He is a first year student at Amanogawa High School within the gyaru crowd who is the third member to join the Kamen Rider Club.
History[]
Prior to coming to AGHS, JK was originally friends with Tojiro Goto and they formed a music duo known as Gene God in junior high in order to fulfill JK's dream. However they separated when they were ridiculed by their peers by their lackluster talent.
On Gentaro's first day, JK gives Gentaro information about the school until running away from Shun Daimonji. During the Queen's Festival, JK learns Gentaro's identity of Kamen Rider Fourze but agrees to keep his mouth shut about it since he wants no trouble. However, being targeted by Fumihiro Nitta, a student he wronged, and seeing the power of the Astro Switches in action personally, JK arranges the theft of the Elek Switch from Gentaro. But the attempt to use the Elek Switch to save his life goes array as JK is held captive by Nitta who allows him to call for help. Though none of his associates come to his aid, Gentaro and the others arrive to save JK. After he learns what friendship really means, JK is made a member of the Kamen Rider Club.
In his second year in AGHS, JK creates the alias of DJ Gene to set up an internet radio show DJ Gene Milky Night Carnival. Although he originally creates the show as a way to live his dream in secret, JK's show becomes far more popular than intended. Soon after, JK is reunited with Goto and becomes conflicted upon learning that his former friend is with the Horoscopes yet has the ability to improve his singing voice. Furthermore, JK is mortified to find Goto brainwashing his listeners into pumped up crazy fans, yet he still wants to live his dream while considering to quit the Kamen Rider Club due to his new-found understanding on the frailty of friendship. Though initially intended to close his show for good after the revelation, he is convinced that he does not want to end up like his father who gave up his dream even leaving the club. However, after seeing Gentaro stopping the Capricorn Zodiarts' music with his father's song, and being forgiven for his role in his former friend's scheme, JK ends his broadcast and dream with the intent to cherish the friendships he has with the Kamen Rider Club.
Heisei Generations FINAL[]

In late 2017, while Kengo oversaw Yuki Jojima's mission into space from mission control in Russia, JK met with Ohsugi at Amanogawa High School as the Enigma device caused the world to be merged with the World of Build. JK soon discovered that Foundation X, represented by the scientist Kaisei Mogami, had a hand in the crisis, which would be resolved within the next day by several Kamen Riders including Fourze. [Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders]
Movie War Ultimatum[]
Kamen Rider Zi-O[]

Other appearances[]
Kamen Rider Travelers Record[]
JK appears in the video game Kamen Rider Travelers Record.
Final Stage[]

JK returns in Final Stage and transformed into Fourze Elek State. [Kamen Rider Fourze: Final Stage]
Personality[]
JK acts as an informant to the students of his school who trades secrets for favors. However, he is known to be a coward as he constantly flees from difficult situations and at times uses people in elaborate schemes to get out of these situations. After being helped by Gentaro Kisaragi from the Unicorn Zodiarts, JK becomes more subornative and joins the Kamen Rider Club. This becomes much more detailed when his old band-mate, Tojiro Goto had become the Capricorn Zodiarts and JK remembering the fragility of friendship, leaving the Kamen Rider Club for a while.
His dream is to become a rock musician like his father, Keizo Jingu, which he had since he was a child, forming a band in middle school and forming an internet radio show in AGHS.
Kamen Rider Fourze[]

Elekstates
- "Elek On! (Electricity crackle, followed by high-energy techno music)"
- ―Transformation announcement[src]
- Height: 200 cm.
- Weight: 97 kg.
- Ability Parameters
- Punching Power: 2.1 t.
- Kicking Power: 6.3 t.
- Maximum Jump Height: 20 m.
- Maximum Running Speed: 100 m. per 5.8 sec.
Elekstates (エレキステイツ, Ereki Suteitsu) is Kamen Rider Fourze's golden form accessed by the powers of the Elek Switch. In Elekstates, Fourze is able to control electricity and use the Billy the Rod. Elekstates' offensive powers are similar to Basestates, but it has greater speed and defense.
This form is exclusive to Kamen Rider Fourze: Final Stage.
Equipment[]
Devices[]
- Fourze Driver - Transformation device
- Astroswitches - Fourze's small devices that allow him access to that Switch's Module when activated in the Driver
- Astroswitch Kaban - Carrier briefcase for Fourze's switches
- Foodroids - Fourze's mini-support robots
Weapons[]
- Billy the Rod - Fourze's sword-like weapon that is used in Elekstates through the Elek Switch
Vehicles[]
- Powerdizer - An independent support vehicle to assist Fourze
Behind the Scenes[]
Portrayal[]
JK is portrayed by Shion Tsuchiya (土屋 シオン, Tsuchiya Shion), who previously made a cameo as a student in episode 15 of Kamen Rider Hibiki. As a child, JK is portrayed by Wataru Sekine (関根 航, Sekine Wataru). As noted in an interview with Shion and Sota Fukushi, who plays Gentaro, in Figure-Oh issue 170, Shion Tsuchiya is a big fan of the Kamen Rider Series, particularly liking Riderman.
Etymology[]
JK is named after Keisuke Jin (神 敬介, Jin Keisuke) (Kamen Rider X); "J.K." are Keisuke's initials, as well as the initials of JK's real name. His given name Kaizo is also a reference, due to the fact that Jin was a 'Kaizorg' (カイゾーグ, Kaizōgu). This homage is alluded to in Fourze's Movie War Mega Max portion, Kamen Rider Fourze: Nadeshiko, Descend, where JK wears a makeshift X-Rider costume as part of the Kamen Rider Club's Seven Legendary Riders cosplay.
Appearances[]
Kamen Rider Fourze
- Episode 1: Youthful Transformation
- Episode 2: Space Superiority
- Episode 3: Queen Election
- Episode 4: Changing Illusion, Secret Maneuver
- Episode 5: Friendship, Inside and Outside
- Episode 6: Electric Shock, Steadily
- Episode 7: King Jerk
- Episode 8: Iron Calvary's Cooperation
- Episode 9: Witch's Awakening
- Episode 10: Moonlight Clash
- Episode 11: Disappearing Moon Door
- Episode 12: Mission: Ken's Life
- Episode 13: School Refusal
- Episode 14: Stinger Onslaught
Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max
- Episode 15: Christmas Eve Choir
- Episode 16: Right and Wrong Conflict
- Episode 17: Meteor Appearance
- Episode 18: Gen/Ryu Showdown
- Episode 19: Steel Dragon, Unmatched
- Episode 20: Transcendent Magnetism
- Episode 21: Mislead Course
- Episode 22: True Self Dismissal
- Episode 23: Swan Alliance
- Episode 24: Hero's Desire
Kamen Rider × Super Sentai: Super Hero Taisen
- Episode 25: Graduation Reluctance
- Episode 26: Perfect Round Dance
- Episode 27: Transformation Rejected
- Episode 28: Star Storm Comeback
- Episode 29: Junior Silence
- Episode 30: Senior, Useless
- Kamen Rider Fourze: Climax Episode
- Episode 31: Subaruboshi Kingdom
- Episode 32: Super Space Sword
- Episode 33: Ancient City Mayhem
- Episode 34: Heavenly Hole, Offensive and Defensive
- Episode 35: Monster's Broadcast
- Episode 36: Serious Legend Song
- Episode 37: Star Follower Selection
- Episode 38: Winner Determination
- Kamen Rider Fourze The Movie: Everyone! Let's Feel the Universe!
- Episode 39: Campus Decree
- Episode 40: Principle or Pathos
- Episode 41: Club Collapse
- Episode 42: Archer's Reign
- Episode 43: Light and Dark Twins
- Episode 44: Star Luck Ritual
- Episode 45: Scale's Estrangement
- Episode 46: Aloof Archer
- Kamen Rider Fourze: Final Episode
- Episode 47: Parting Friends
- Episode 48: Final Episode: Youthful Galaxy
- Kamen Rider Fourze: Final Stage
Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders
Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum
Kamen Rider Zi-O
- Episode 5: Switch On! 2011 (photo only)