Soshina is a theme song performer and voice actor for the 20th anniversary Sgt. Frog film, which opens in Japan on June 26, 2026.
Soshina, a comedian and singer, is involved in the 20th anniversary Sgt. Frog film in two capacities. The film's staff announced in May that Soshina and singer ano perform the opening theme song and also voice characters in the film. The opening theme is titled "Mata Kaettekita KERO! to MARCH."
In June, Soshina attended a pre-release event in Tokyo alongside cast members Kumiko Watanabe, Etsuko Kozakura, and ano. At the event, Kozakura praised the death voice technique used in the theme songs performed by ano and Soshina. A promotional video later that month previewed the opening song and introduced the platoon.
The film is the first theatrical entry in the franchise in 16 years. A new television anime series with a fresh cast is set to debut in fall 2026. Soshina's role in the film marks a continuation of the franchise's tradition of integrating music talent into the voice cast for anniversary projects.
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The staff for the 20th anniversary Sgt. Frog film began streaming a promotional video on Tuesday. The video introduces the platoon and features the opening theme song "Mata Kaettekita KERO! to MARCH" by singer ano and comedian Soshina. The film opens in Japan on June 26.
A pre-release event for the new Keroro Gunsou film was held in Tokyo on June 16. Cast members Kumiko Watanabe, Etsuko Kozakura, ano, and Soshu discussed the film, the first theatrical entry in 16 years. Kozakura praised the death voice technique in the theme songs performed by ano and Soshu.
The 20th anniversary Sgt. Frog film announced that singers ano and Soshina, who perform the opening theme, will also voice characters in the film. Comedian Shinobu Hasegawa will narrate. The film opens in Japan on June 26, and a new TV anime with a fresh cast debuts in fall 2026.