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Seiichiro Nagata
In 2016, he made his acting debut in the 3rd season of the musical “The Prince of Tennis”. On October 2, 2017 he transferred from Watanabe Entertainment to SUI Co., Ltd. He is active in 2.5 stages and Musical Touken Ranbu as Murakumo Gou. In November 2023, he appeared in "Kamen Rider Gatchard" and " Kamen Rider Gatchard VS Kamen Rider Legend" as Houou Kaguya Quartz. He left SUI Co., Ltd. on April 30, 2024 and became a freelancer starting May 1, 2024. On July 1st of the same year, he opened his first official fan club and official website.
Known For

Kamen Rider Gotchard: The Future Daybreak
as Ho-Oh Kaguya Quartz / Kamen Rider Legend

Nanashi: Seventh Special Cause of Death Department: The Stage
as Tsuyobi

Kamen Rider Gotchard: Final Stage
as Ho-Oh Kaguya Quartz/Kamen Rider Legend

Labyrinth Opera: Pretty Boy Detective Club
as Michiru Fukuroi

Kamen Rider Gotchard Final Episode: You and Me, We've Got CHEMY×STORY - Director's Cut Version
as Ho-Oh Kaguya Quartz / Kamen Rider Legend

Labyrinth Opera: Pretty Boy Detective Club Continued
as Michiru Fukuroi

Musical Touken Ranbu: Gou on Stage Zepp Tour
as Murakumo Gou

No. 1 Sentai Gozyuger Anniversary Discussion
as Kamen Rider Legend (voice)

Musical Touken Ranbu: Memories of Tokyo
as Murakumo Gou

Kakegurui Stage
as Ryota Suzui