Eiji Akaso
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Akaso Eiji is a Japanese actor and model, known for playing Ryuga Banjou in Kamen Rider Build. He is currently represented by Tristone Entertainment. He belonged to the Nagoya model office "FORM JAPAN" when he was in his teens. He was active as a model and talent under the name Mamoru Akaso (赤楚 衛, Akaso Mamoru). In 2010, he joined the local idol group "BOYS AND MEN" in Nagoya, working on stage performances and regular appearances of variety shows. Eiji is said to have left "BOYS AND MEN" in 2011. Originally, he entered the entertainment agency because he wanted to be an actor and not an idol. He won the Grand Prix at the men's model audition of Samantha Thavasa in 2013, which became the turning point for him to audition in Tokyo at the age of 19. The trigger that lead Eiji to drop out of university and to enter the world of entertainment was a call from the CEO of his current agency in 2014. In 2015, he transferred to his current agency Tristone Entertainment, working as an actor and starring in television dramas and films in his current stage name
Known for
Credits
KINKI (2025)
as Ozawa Yusei
Tokyo MER: Mobile Emergency Room - Capital Crisis (2026)
Actor
Kyojo Reunion (2026)
Actor
Zom 100: Bucket List of the Dead (2023)
as Akira Tendo
Kamen Rider Build: Be The One (2018)
as Ryuuga Banjou · Kamen Rider Cross-Z
Closest Love to Heaven (2017)
as Schoolmate
Kamen Rider Heisei Generations Forever (2018)
as Ryuuga Banjou / Kamen Rider Cross-Z
Cherry Magic! THE MOVIE (2022)
as Kiyoshi Adachi
Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z (2019)
as Ryuga Banjou / Kamen Rider Cross-Z
Keep Your Hands Off Eizouken! (2020)
as Kobayashi
Kamen Rider Build NEW WORLD: Kamen Rider Grease (2019)
as Ryuga Banjou / Kamen Rider Cross-Z
Kamen Rider Build: Birth! Bear Televi!! VS Kamen Rider Grease! (2018)
as Ryuga Banjo / Kamen Rider Cross-Z
Love Me, Love Me Not (2020)
as High School Boy (voice)
Love Me, Love Me Not (2020)
as Kazuomi Inui
Six Lying University Students (2024)
as Shogo Hatano
My Long Awaited Love Story (2017)
Actor
What If Shogun Ieyasu Tokugawa Was to Become the Prime Minister (2024)
as Ryoma Sakamoto
The Great Yokai War: Guardians (2021)
as Amanojaku
One Year to Live, Buy a Man (—)
Actor
Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders (2017)
as Ryuuga Banjou / Kamen Rider Cross-Z
Kamen Rider Build: Final Stage (2019)
as Ryuga Banjou / Kamen Rider Cross-Z
Kamen Rider Amazons Season 2 the Movie: Reincarnation (2018)
as Hiroki Nagase
Super Hero Festival: Kamen Rider x Super Sentai Live & Show 2018 (2018)
as Self / Kamen Rider Cross-Z (voice)
366 Days (2025)
as Minato Makiya
The Sunday Runoff (2022)
Actor
Tales of the Bizarre: 2021 Fall Special (2021)
Actor
Hakutaka Shirataka Amane no Investigation File (2021)
as Uzuka Shinsaku
Kamen Rider Build: Special Event (2018)
as Ryuga Banjou / Kamen Rider Cross-Z
Commuting to School Series On the Way to School (2015)
Actor