Anime 'Chiikawa: The Secret of the Mermaid Island' to be released in summer 2026
The popular manga series 'Chiikawa' by illustrator Nagano has been adapted into a film. The film is based on a feature-length story posted on X between March and November 2023, in which Chiikawa and his friends visit an island. The film is titled ' Chiikawa the Movie: The Secret of Mermaid Island ' and is scheduled for release in the summer of 2026.
'Chiikawa the Movie: The Secret of Mermaid Island' Official Website
The visual released is a fantastical one, showing Hachiware, Chiikawa, and Usagi bathed in moonlight on a small boat.
Chiikawa has been decided to be made into a movie! 🎉
— Chiikawa💫Anime Tuesday (@ngnchiikawa) November 24, 2025
It is scheduled to be released in the summer of 2026 🐟 https://t.co/WAW0fbBAAg pic.twitter.com/2afVnL6j5W
©ナガノ / 2026「映画ちいかわ」製作委員会
The original author, Nagano, will also be writing the script. He sent us the following message with an illustration:
Chiikawa has been decided to be made into a movie!!
The title is 'The Secret of Mermaid Island'
This is a story about going to an island that I posted on X from March to November 2023.
Chiikawa and friends' journey on the big screen for the first time
We hope you'll look forward to it!!
At the end of the comment, there was also a message from the island's resident duo: 'MATA' and 'AERUNE!!'
/
— Toho Movie Information [Official] (@toho_movie) November 24, 2025
' #Chiikawa '
Comments from original author and scriptwriter Nagano have arrived!
＼
Chiikawa has been decided to be made into a movie!!
The title is 'The Secret of Mermaid Island.'
This is a story about going to an island that I posted on X from March to November 2023.
Chiikawa and his friends' journey on the big screen for the first time.
We hope you'll look forward to it!!
🎬Released in summer 2026... pic.twitter.com/wGQnmXkF4c
'Chiikawa' is a manga series that Nagano has been posting on X (formerly Twitter). The characters themselves have been drawn since around 2017.
I want to live pic.twitter.com/MiBNTrP8sA
— Nagano (@ngntrtr) May 1, 2017
In January 2020, a separate account for 'Chiikawa' was launched, separate from Nagano's account. Initially, single illustrations and series of illustrations were posted, but from late January, she also began posting manga-style illustrations with clearly defined panels.
Replying to @ S1exDdaEhd
— Chiikawa💫Anime Tuesday (@ngnchiikawa) January 27, 2020
Starting in 2022, the series will be made into a TV anime series, with animation produced by Doga Kobo, and will be broadcast on Mezamashi TV.
'Chiikawa' to be animated, produced by Doga Kobo - GIGAZINE
The episodes that will be made into films are those posted as part of a long-running series that will run from March to November 2023. Chiikawa has a variety of episodes, from one-offs to mid-length stories, but they were not individually titled when posted, and Nagano described them as 'a story about going to an island.'
— Chiikawa💫Anime Tuesday (@ngnchiikawa) March 12, 2023
The eighth volume of the 'Chiikawa' manga, published on Friday, November 21st, compiles these episodes into one book, and is described in the announcement as 'The Story of the Island.'
— Nagano (@ngntrtr) November 20, 2025
On Toho Movie Information's X account, it is referred to by one of its nicknames, 'The Siren Arc.'
/
— Toho Movie Information [Official] (@toho_movie) November 24, 2025
' #Chiikawa '
The long-awaited first film adaptation has been decided!
＼
🎬Scheduled to be released in summer 2026!
'Chiikawa the Movie: The Secret of Mermaid Island'
'Chiikawa,' which has sparked numerous social phenomena, is finally coming to the big screen!
The story will feature a unique and popular full-length episode in the series, known as the 'Siren Arc'! … pic.twitter.com/MAxo11NCl0
The original story is a very 'Nagano-flavored' episode, so it will be interesting to see what Nagano himself will add or subtract as he writes the script.
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