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Studio 4°C's ChaO Anime Film Reveals Kumi Koda's Theme Song in Trailer
posted on by Crystalyn Hodgkins
Poster visual also revealed for film opening in Japan on August 15
Kumi Kōda's theme song "ChaO!," written specifically for the film.
The staff also revealed a new poster visual for the film.

©2025「ChaO」製作委員会
The film will open in Japanese theaters on August 15.
Fantasia International Film Festival, which runs from July 16 through August 3 in Montreal.
The company describes the story:
From acclaimed Japanese animation production house Studio 4°C comes a wild romantic comedy and true “fish out of water” story. In a futuristic world where humans and mermaids coexist, ChaO follows Stephan, a mild-mannered office worker at a shipbuilding company, whose life is upended when he is suddenly proposed to by Chao — a princess from the mermaid kingdom. With no time to make sense of what's happening, Stephan soon finds himself living with the unpredictable, wholehearted Chao. As her sincere love begins to break down his emotional barriers, an unexpected and touching romance begins to unfold.
Saki) plays ChaO, the pure princess of the mermaid kingdom.
The film also stars:
- Yūichirō Umehara as Roberta
- Nankai Candies comedy duo member Ryōta Yamasato as President Shi
- Kavka Shishido as Maibei
- Yasei Bakudan comedy duo member Cookie! as Ambassador Omede
- Kenta Miyake as the King Neptunus
- Octpath idol group member Shunsei Ōta as Juno
- Anna Tsuchiya as Editor-in-Chief
Toei will distribute the film.
Oricon reported that Studio 4°C had been secretly working on the film for the last seven years. Producer Eiko Tanaka stated in the film's January press conference that the film is hand drawn with more than 100,000 drawings.
Sources: ChaO! anime film's website, Comic Natalie