This article is about a/an ally in Kamen Rider Drive.

Kenta Imai (今井 健太 Imai Kenta), more commonly known as Kyu Saijo (西城 究 Saijō Kyū), The Special Investigation Unit's network researcher. Outside the team, he is also a successful writer, well-known in the otaku community.


Kenta Imai/Kyu Saijo is a popular writer in the otaku community. He was hired as the Special Investigation Unit's network researcher, his approach to cases can sometimes get him into trouble with the team. Kyu mostly assists the team with clues regarding the culprit while trying to get information on the mysterious Kamen Rider.

In episode 20, it was revealed that he had a Roidmude imposter, Roidmude 072, different from other Roidmudes in that he wanted to live a normal life among humans. In certain occasions, 072 would take Kyu's place in the Special Investigation Unit and help them in tracking Roidmude culprits. The copy was killed by Medic after he was unmasked. Kyu was deeply saddened by 072's death after he was reported to have become berserk and killed by Drive but quickly comforted by his teammates. In reality, 072 requested Drive to lie about his death as it would deeply affect Kyu.

Despite 072's loss, Kyu was able to find an alternative way to detect Roidmudes by tracing their data patterns. What Can Be Spoken About the Irregular Dead?

Discovery of the Kamen Riders' identities


Genpachiro and Kyu find out Drive's secret identity.

After a case where Hajime Taga bonded with Roidmude 007 to form Sword Roidmude, Kyu was sent by Shinnosuke to spy on Kiriko because of her suspicious behavior at the time. He tailed Kiriko in the woods, where she talked to Chase and revealed himself to support Kiriko's claims that not all Roidmudes were not evil after all, as he could relate.

He finally witnessed Shinnosuke transforming into Kamen Rider Drive after being forced to save Tomari's former partner Hayase from Hajime. After the fight ended, he and Genpachiro discover Kiriko's little brother Go's identity as Kamen Rider Mach. At the end of the day, both him and Gen were brought to the Drive Pit for the first time, bringing deep excitement to Kyu. Why Has a New Battle Started?

After the elimination of the Roidmude threat, Kyu went on to become a popular network researcher and author. His novel, which recounts his experiences with the Special Investigation Unit, became a best seller. Who Will You Entrust the Future to, My Friend?

Super Movie Wars Genesis

Kyu attended the wedding of Shinnosuke and Kiriko along with the rest of the former Special Investigation Unit as well as the Mysterious Phenomenon Institute team. Kamen Rider × Kamen Rider Ghost & Drive: Super Movie Wars Genesis

Super Hero Taisen GP

In the altered timeline created by Shocker's History Modifying Machine, Kyu and Rinna are still members of the Special Investigation Unit which as a police force serves Shocker which rules the world. They are later wanted by Shocker after they witnessed Jun Honganji's murder by Genpachiro Otta, who had been remodeled into the Shocker cyborg Cheetahkatatsumuri. Disguising themselves, they appear as spectators at the Rider Grand Prix where they cheer on the freed Kamen Rider, Drive. Their alternate lives in this world are unwritten when the destruction of the History Modifying Machine restores the timeline, returning them to their proper place in history. Super Hero Taisen GP: Kamen Rider 3


Kyu is the stereotypical "nerd", specifically into cartoons and the occult. Kyu likes watching the anime Murmur Mansion to the point where he often wears the show's official T-shirt and owns dolls of its characters. Kyu often portrays comical tendencies and will try to lecture anyone who would offend his interests. According to Roidmude 072, Kyu may seem happy at all times, but he can be easily saddened.

Behind the scenes


Kyu Saijo is portrayed by Kenta Hamano (浜野 謙太 Hamano Kenta).


His net name Kyu Saijo (西城 究 Saijō Kyu) is a homonym of the Japanese phrase The Highest Level (最上级 Saijō Kyu). For his profile in a network group.

His real name Kenta Imai (今井 健太 Imai Kenta) is likely taken from his actor's name, Kenta Hamano (浜野 謙太 Hamano Kenta)


Icon-drive Kamen Rider Drive
Kamen Riders
TV Series: Shinnosuke Tomari - Go Shijima - Chase - Tenjuro Banno - Kamen Rider Mach (Production Model) (Jun Honganji)
Movie/Special/Stageshow-exclusive: Zoruku Tojo - Kyoichiro Kuroi - Kamen Rider 4 - Paradox Roidmude - Heart - Brain
Special Investigation Unit
Shinnosuke Tomari - Kiriko Shijima - Krim Steinbelt - Jun Honganji - Genpachiro Otta - Rinna Sawagami - Kyu Saijo

Unofficial Members: Roidmude 072 - Go Shijima - Chase - Mitsuhide Nira (defected)

Other allies
Akira Hayase - Harley Hendrickson - Kyoichiro Kuroi - Eisuke Tomari - Eiji Tomari - Ninningers - Ryu Terui - Takumi Inui - Yuto Sakurai - Sakuya Tachibana - Kamen Rider Blade - Kamen Rider Chalice - Kamen Rider Leangle
Creator: Tenjuro Banno

Generals: Heart - Brain - Chase (defected) - Medic - Freeze - Krim Steinbelt (copy) - Roidmude 005 - Roidmude 006 - Tornado - Paradox

Minor Advanced Roidmudes: Reaper Legion - Iron Roidmude - Paint Roidmude - Crush Roidmude - Scooper Roidmude - Volt Roidmude - Gunman Roidmude - Voice Roidmude - Judge Roidmude - Shoot Roidmude - Shocker Buruburu - Angel Roidmude

Fusion Evolution State: Sword Roidmude - Seeker Roidmude - Open Roidmude - Cook Roidmude - Thief Roidmude

Unofficial: Mitsuhide Nira - Sigma Circular

Other villains
Zoruku Tojo - Imitation Drive - Kibaoni Army Corps - Shocker - Neo Shade - Ganma (Da Vinci Gamma)
Mu:Leader of Mu
Executive :Shocker Leader III
Kamen Riders :Kamen Rider Dark Kiva - Kamen Rider Poseidon - Kamen Rider Wiseman - Kamen Rider Duke - Kamen Rider Dark Ghost - Kamen Rider Another Para-DX
Monsters :Cancer Zodiarts - Gremlin - Demushu - Gamma Superior - Graphite
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