New cast members and character introduction videos have been unveiled for STUDIO4°C’s original theatrical anime ChaO, ahead of its premiere on August 15. The film has also been nominated in the Feature Film category at the 2025 Annecy International Animation Film Festival.
New Teaser:
Teaser Visual:

CAST:
Oji Suzuka as Stephen
Anna Yamada as Chao
ADDITIONAL CAST:
Ryota Yamasato as President Sea
Kavka Shishido as Mai Bei
Yuichiro Umehara as Roberta
Kenta Miyake as King Neptune
Ota Shunsei as Juno
Anna Tsuchiya as Editor-in-Chief
Cookie! as the Ambassador Omede
STAFF:
Director: Yasuhiro Aoki
Character Designer/ Animation Director: Hirokazu Kojima
Background Art Director: Hiroshi Takiguchi
Production: STUDIO4°C
Annecy Festival describes the film as follows:
In a near-future world where humans and mermen coexist, Stephen, a shipping engineer in Shanghai, develops a propeller called Air Jet that is harmless for marine life to promote peace between the two races. When Chao, a mermaid princess, pushes Stephen to marry her, their two worlds collide. As they struggle with their cultural differences, a tragic accident creates a bigger strain on their relationship.
Source: Comic Natalie
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