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[2026] Chiikawa Movie "The Secret of the Mermaid Island" | Release Date, Voice Actors, and Bonus Features Summary
"Chiikawa: The Secret of the Mermaid Island" was released nationwide on July 24, 2026 (Friday). Based on official announcements, we'll introduce everything from the release date, synopsis, voice cast, theme song, running time, admission特典 (special gifts for attendees), and IMAX screening information for this Chiikawa movie, which is an adaptation of the original "Siren Arc."
[2026] Chiikawa Movie "The Secret of the Mermaid Island" | Release Date, Voice Actors, and Bonus Features Summary
Q. When is the release date for the movie "Chiikawa: The Secret of the Mermaid Island"?
A. It will be released nationwide on Friday, July 24, 2026. The IMAX version will also be showing from the same day.
Q. How long is the running time?
A. 99 minutes.
Q. Which episode is from the original work?
A. This is the long-form episode, commonly known as the "Siren Arc," from Nagano's original manga, "Chiikawa: A Small and Cute Girl."
Q. Are there any special gifts for attendees?
A. As the first release, "Charm Mini Figures" (8 types in total, randomly selected) have been distributed since July 24th (Friday).
table of contents
- Basic information about the movie "Chiikawa: The Secret of the Mermaid Island"
- Synopsis
- What kind of story is the original "Siren Arc"?
- Voice Actor Cast List
- Theme song "Kutsuzure" and song from the film "Shima no Uta"
- Staff
- IMAX version shown simultaneously
- Special benefits for attendees / Barrier-free screenings
- Collaboration project to coincide with the release
- Frequently Asked Questions (FAQ)
1. Basic information about the movie Chiikawa's "The Secret of the Mermaid Island"
The movie "Chikawa: The Secret of the Mermaid Island" is the first theatrical animated film in the Chikawa series. It is based on the manga "Chikawa: Something Small and Cute" which illustrator Nagano has been serializing on X (formerly Twitter) since 2020, with Nagano himself handling the original story and screenplay.
| item | Content |
| Work name |
The movie Chiikawa: The Secret of the Mermaid Island
|
| Release date | Friday, July 24, 2026 |
| Screening time | 99 minutes |
| Original story and screenplay | Nagano |
| director | Kei Oikawa |
| Animation production |
CygamesPictures
|
| distribution | Toho |
| Screening format | Regular version/IMAX version |
The original manga has won the "Japan Character Award Grand Prix" three times, and the TV anime, which began airing in 2022, has garnered well over 400 million total views on YouTube for its on-demand streaming. Against this backdrop of popularity, the Chiikawa movie was produced as the first theatrical film.
2. Synopsis
One day, as Chiikawa and Hachiware were relaxing in the town square, a rabbit with a flyer stuck to its face approached them. When Hachiware examined the flyer, it read, "Invitation to a special island."
"Earn 100 times the reward for an easy monster hunt on the island," "Limited island ramen and sweets, sweet and spicy food all practically free"—lured by these words, Chiikawa and her friends decide to participate in the island training camp. Along with Otter, who is suspicious of the flyer's contents, they board a boat and land on the island, where Chiikawa and her group are met with...
Chiikawa and her friends receive a warm welcome on the island, enjoying the local cuisine and sightseeing, but they soon learn the real reason they were invited to the island: to defeat the sirens that are attacking the islanders.
3. What kind of story is the original "Siren Arc"?
The film is based on the long and popular story arc from the original manga, commonly known as the "Siren Arc." Fans also refer to it as the "Island Arc."
In the Chiikawa movie, this episode has been adapted into a film under the complete supervision of Mr. Nagano. The main difference is that, unlike the short episodes in the TV anime, it is depicted as a full-length adventure set on an island.
Furthermore, memorable characters from the original work appear in the film, such as Shimajiro, the shop owner whom Chikawa finds deep in the forest, and Siren, who possesses the mysterious power of song.
4. Voice Actor Cast List
The voice cast for the movie "Chiikawa: The Secret of the Mermaid Island" is as follows:
| character | voice actor |
| Chiikawa | Haruka Aoki |
| Hachiware | Makoto Tanaka |
| rabbit | Ari Ozawa |
| Flying squirrel | Yuka Iguchi |
| Chestnut bun | Takayuki Asai |
| Sea otter | Yuma Uchida |
| Shisa | Miyuri Shimabukuro |
| Used bookstore | Harumi Momuno |
| Shimajiro | Tsuguo Mogami |
| Siren | Minori Suzuki |
| Human | Momoka Terasawa |
| Futaba | Sayumi Suzushiro |
Tsuguo Mogami, who will play Jiro Shima, and Minori Suzuki, who will play Siren, were announced along with the release of the 90-second trailer.
5. Theme song "Kutsuzure" and song from the film "Shima no Uta"
The opening theme for the film is a new song titled "Kutsuzure," with lyrics written by Nagano. Following the TV anime series song "Hitorigotsu," Hachiware (CV: Makoto Tanaka) is in charge of the vocals.
In addition, "Shima no Uta" (Island Song), a song whose lyrics were memorably depicted when Chiikawa and her friends visited the island in the original manga, will appear in musical form for the first time in this video production.
The music is handled by Shugo Tokumaru and Riki Kamimizutaru.
6. Staff
| post | in charge |
| Original story and screenplay | Nagano |
| director | Kei Oikawa |
| Character design | Tomoko Tsuji |
| Concept art | Masaki Hashimoto |
| art director | Masaki Moe |
| CG director | Yoshinori Nakano |
| sound director | Masaki Tsuchiya |
| music |
Tokumaru Shugo / Kamimizutaru Riki
|
| Animation production | Cypik |
Director Kei Oikawa is known for his work on the TV anime series "Uma Musume Pretty Derby," among others. CygamesPictures, which is in charge of animation production, is also producing "Uma Musume Pretty Derby: The Movie - A New Era."
7. Simultaneous screening of the IMAX version
"The movie Chiikawa: The Secret of the Mermaid Island" is also being screened in IMAX from its release date, July 24th (Friday).
With a massive screen that stretches from floor to ceiling and across both walls, and high-precision sound, you can enjoy your island adventure in a more immersive way. The song by Hachiware and the rabbit's rap, revealed for the first time in the film, can be experienced with IMAX's unique sound system.
To coincide with the release of the IMAX version, a "MAX visual" poster featuring large illustrations of Chiikawa, Hachiware, and Usagi has also been unveiled.
8. Special benefits for attendees and barrier-free screenings
Admission Bonus - Part 1: Charm Mini Figure
Starting July 24th (Friday), one specially designed charm mini-figure will be distributed to each person who watches the film at participating theaters.
| item | Content |
| kinds | 8 types in total (random) |
| Distribution start date |
Friday, July 24, 2026
|
| Distribution method |
Distributed upon entry to the theater
|
| Points to note |
You cannot choose the type / Limited quantity, while supplies last
|
Each person is limited to receiving one bonus item per screening, even if they have multiple reserved seat tickets. Please note that the bonus items will be distributed upon entering the theater for the screening, not at the time of ticket purchase.
Barrier-free screening
This film uses the "HELLO! MOVIE" format for its audio guide and Japanese subtitles. Both will be available starting August 7, 2026 (Friday), and will not be available before then.
9. Collaboration project to coincide with the release
Several collaborative projects are also being held to coincide with the release.
- Collaboration with Yokohama City A sticker giveaway campaign, the installation of photo spots, and a special collaborative fireworks display were announced (announced July 21, 2026).
- Collaboration fair with Seven-Eleven Products inspired by the food featured in the story, such as "Braised Red Snapper" and "Shimajiro's Clam Soup," have been released (announced July 20, 2026).
Frequently Asked Questions (FAQ)
Q1. Which film in the series is "Chiikawa: The Secret of the Mermaid Island"?
A. This is the first theatrical animated film in the Chiikawa series.
Q2. Can I enjoy this even if I haven't read the original work?
A. This work is an adaptation of the original "Siren Arc," but the story progresses as an adventure of Chiikawa and her friends who are invited to the island, so you can follow the story even if you haven't read the original. The original is included in the comic book "Chiikawa: A Small and Cute Girl."
Q3. Who sings the theme song?
A. The opening theme song, "Kutsuzure," is sung by Hachiware (CV: Makoto Tanaka). The lyrics were written by the original author, Nagano.
Q4. Can I receive the admission gift multiple times?
A. Only one item will be given per person per screening. Also, there is a limited number available at each theater, and the offer will end once supplies run out.
Q5. Where can I check the screening schedule?
A. The theaters showing the film, the number of screenings, and the start date and time for seat reservations vary by theater, so please check the theater information page on the official website or the official website of each movie theater.
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