ChaO
“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.
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Cast
9 people
Ouji Suzuka
Stephan (voice)
Known for
The Tunnel to Summer, the Exit of Goodbyes
THE DAYS
Anna Yamada
Chao (voice)
Known for
Suicide Forest Village
Liverleaf
Kavka Shishido
Maibei (voice)
Also in
I Will Not Work Overtime, Period!
Revolver Lily
Yuichiro Umehara
Roberta (voice)
Known for
Black Clover
DARLING in the FRANXX
Kenta Miyake
King Neptunus (voice)
Known for
My Hero Academia
Fullmetal Alchemist: Brotherhood
Shunsei Ōta
Juno (voice)
Also in
The Revenge Lover
Senpai, This Can't Be Love!
Anna Tsuchiya
Editor-in-Chief (voice)
Known for
NANA
Kamikaze Girls
Kunihiro Kawashima
Ambassador Omede / Photographer / Shop Owner (voice)
Known for
The Violence Action
Ryota Yamasato
President Shi (voice)
Also in
One Piece: Stampede
On Air Dekinai!
Yasuhiro Aoki Director · Saku Konohana Screenplay Takatsugu Muramatsu Composer
United States release April 10, 2026 · Produced in Japan
Production
STUDIO4℃
Production · Studio
Japan
Produced in
Languages
Original language
Japanese
Spoken on screen
Japanese
Release dates
France · June 9, 2025
Premiere · Annecy International Animation Film Festival
Japan · August 15, 2025
Theatrical
United States · April 10, 2026
Theatrical
United States · June 23, 2026
Digital
United States
July 10, 2025 · Premiere · JAPAN CUTS
October 18, 2025 · Premiere · Animation Is Film Festival
September 22, 2026 · Physical · Blu-ray
Australia
October 18, 2025 · Premiere · Adelaide Film Festival
Canada
July 27, 2025 · Premiere · Fantasia International Film Festival
September 25, 2025 · Premiere · Ottawa International Animation Festival
Chile
April 23, 2026 · Theatrical
Colombia
April 23, 2026 · Theatrical
Czechia
June 11, 2026 · Theatrical
France
May 13, 2026 · Theatrical
Guatemala
April 23, 2026 · Theatrical
India
August 7, 2026 · Theatrical
Ireland
April 9, 2026 · Premiere · Japanese Film Festival
Italy
June 25, 2026 · Limited theatrical
New Zealand
March 21, 2026 · Premiere · Wellington Animation Film Festival
Peru
April 23, 2026 · Theatrical
Poland
September 28, 2025 · Premiere · International Film Festival TAURON Young Horizons
Puerto Rico
April 9, 2026 · Limited theatrical
Russia
May 28, 2026 · Theatrical
South Korea
October 24, 2025 · Premiere · Bucheon International Animation Festival
October 21, 2026 · Theatrical
Sweden
September 18, 2026 · Theatrical
Taiwan
August 22, 2025 · Theatrical
December 4, 2025 · Digital · CATCHPLAY+
Thailand
October 16, 2025 · Premiere · Dex Films Fest
December 25, 2025 · Theatrical
United Kingdom
October 11, 2025 · Premiere · London Film Festival
November 8, 2025 · Premiere · Leeds International Film Festival
November 15, 2025 · Premiere · Scotland Loves Anime
May 9, 2026 · Premiere · Flatpack Festival
December 4, 2026 · Limited theatrical
More from Yasuhiro Aoki
Other films they directed, best known first.
Some details come from TheTVDB.