He's on the hook.
In a futuristic world where humans and mermaids coexist, the life of mild-mannered office worker Stephan 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, and her sincere love begins to break down his emotional barriers.
ChaO (2025) is a animation, fantasy and romance film directed by Yasuhiro Aoki, released on August 15, 2025 with a runtime of 1h 30m. It stars Ouji Suzuka, Anna Yamada, Kavka Shishido and Yuuichirou Umehara. Viewers rate it 8.2 out of 10 across 15 ratings.
Watch the official trailer for ChaO before you stream it.
Ouji Suzuka
as Stephan (voice)
Anna Yamada
as Chao (voice)
Kavka Shishido
as Maibei (voice)
Yuuichirou Umehara
as Roberta (voice)
Kenta Miyake
as King Neptunus (voice)
Shunsei Ōta
as Juno (voice)
Anna Tsuchiya
as Editor-in-Chief (voice)
Kunihiro Kawashima
as Ambassador Omede / Photographer / Shop Owner (voice)
Ryota Yamasato
as President Shi (voice)
Directed by Yasuhiro Aoki, written by Saku Konohana, produced by Eiko Tanaka.
Average viewer score of 8.2/10 from 15 ratings.
ChaO delivers in that it spans a wide range of genres and makes you feel a spectrum of emotions in the span of an hour and a half. Its unusual animation style makes it more memorable, since it doesn’t look like anything else out there and will be remembered for its extraordinary, one-of-a-kind aesthetic. It also helps that it’s hilarious. https://bit.ly/MermanChaO
Reviewed on April 11, 2026
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ChaO (2025) is currently available to rent or buy from Amazon Video, Apple TV Store, Google Play Movies, YouTube and Fandango At Home. No subscription streaming option is listed right now, so availability may change.
The main cast of ChaO (2025) includes Ouji Suzuka, Anna Yamada, Kavka Shishido, Yuuichirou Umehara and Kenta Miyake. The film was directed by Yasuhiro Aoki. You can see the full cast and crew list, with character names, further up this page.
ChaO was released on August 15, 2025 and runs for 1h 30m.
ChaO (2025) holds an average rating of 8.2 out of 10 from 15 viewer votes, and is a good pick if you enjoy animation, fantasy and romance films. Read the viewer reviews on this page to decide for yourself.
Yes. The official ChaO trailer is embedded in the trailer section of this page and plays instantly, no download or sign-up required.
