by Chiikawa: The Secret of Mermaid Island has achieved another major box-office milestone in Japan, becoming the highest-grossing film released in Japan in 2026 so far.
The first theatrical movie based on Nagano’s popular Chiikawa franchise has earned approximately ¥15.84 billion at the Japanese box office and attracted 10.857 million moviegoers in just 59 days after opening on July 24, 2026. The result has pushed the film beyond the previous franchise record held by Detective Conan: The Million-dollar Pentagram, which earned approximately ¥15.8 billion in 2024.
The achievement is particularly remarkable because this is the first feature film in the Chiikawa franchise. What began as Nagano’s short social-media illustrations has now grown into one of Japan’s biggest character and anime properties, with the movie reaching a level of box-office success normally associated with long-running theatrical franchises.
The film’s official team has also released new still images featuring Chiikawa, Hachiware, and Usagi, thanking audiences for their continued support and teasing that the characters’ adventure is “far from over.”
Chiikawa Becomes the No. 1 Japanese Film of 2026
As of September 20, 2026, Chiikawa: The Secret of Mermaid Island had sold approximately 10.857 million tickets and generated ¥15.84 billion in domestic box-office revenue.
That result puts the film at No. 1 among films released in Japan in 2026 so far. It had already overtaken Detective Conan: Fallen Angel on the Highway, which had previously been the year’s leading release.
The film’s latest milestone is even more significant because it has now moved past the approximately ¥15.8 billion earned by Detective Conan: The Million-dollar Pentagram in 2024.
That film had set a new all-time box-office record for the Detective Conan movie series. Chiikawa has now exceeded that franchise benchmark.
In other words, a franchise known for tiny, cute characters has achieved a box-office result higher than the previous record-holder from one of Japan’s most established annual anime movie series.
Chiikawa’s Box Office Journey Has Been Remarkable
The film’s current ¥15.84 billion total is the result of an unusually strong and sustained theatrical run.
From the beginning, Chiikawa: The Secret of Mermaid Island attracted enormous attention.
The movie opened in Japan on July 24, 2026, across 447 theaters, including 382 regular theaters and 65 IMAX theaters.
Its opening day was particularly impressive.
The movie earned approximately ¥990 million on its first day alone, making it one of the biggest opening-day performances in Japanese box-office history. It also narrowly exceeded the ¥960 million opening-day result recorded by Detective Conan: The Million-dollar Pentagram in 2024.
Over its first three days, the film generated approximately ¥2.24 billion and sold around 1.5 million tickets.
The strong opening was only the beginning.
Chiikawa Movie Box Office Milestones
The film’s box-office progression included:
- Opening day: approximately ¥990 million
- First three days: approximately ¥2.24 billion
- 10 days: approximately ¥4.4 billion
- 17 days: approximately ¥6.77 billion
- 20 days: approximately ¥8.07 billion
- 24 days: approximately ¥9.28 billion
- 30 days: surpassed ¥10 billion
- 59 days: ¥15.84 billion and 10.857 million admissions
For a first theatrical film, maintaining that level of audience interest for nearly two months is a major achievement.
The Film Broke Out From the Very First Day
The excitement surrounding the movie was visible at theaters from its opening morning.
According to reports, screenings sold out early, with theaters preparing unusually large numbers of showings to accommodate demand.
TOHO Cinemas Ikebukuro reportedly scheduled the movie 41 times in a single day, illustrating how strongly theaters anticipated demand for the first Chiikawa feature.
The ¥990 million opening-day result was therefore not simply the result of a small number of premium screenings. The movie received a major nationwide theatrical rollout and quickly became one of the defining animated releases of the summer.
What Is Chiikawa: The Secret of Mermaid Island About?
For viewers who are new to the franchise, Chiikawa: The Secret of Mermaid Island adapts the popular Siren Arc, one of the most talked-about storylines from Nagano’s original manga.
The story begins when Chiikawa, Hachiware, and Usagi receive an invitation connected to a special island.
What initially appears to be an exciting island trip gradually turns into something much more mysterious.
The trio encounters a powerful sea creature known as Siren, along with mermaid characters connected to the island.
The characters soon discover that the island has a hidden history and that their seemingly enjoyable adventure is connected to a much more serious situation.
This mixture of cute characters, adventure, mystery, and darker themes has been one of the reasons the Siren Arc became so popular with Chiikawa fans.
The Siren Arc Was Expanded for the Big Screen
The film is not simply a compilation of television episodes.
The Siren Arc was specifically developed into a feature-length theatrical story, with original creator Nagano closely involved in the project.
Nagano wrote the film’s screenplay/story and supervised the project, allowing the theatrical adaptation to preserve the tone and atmosphere of the original work while expanding the adventure for a feature-length format.
This was an important decision for the franchise’s first movie.
Rather than creating an unrelated story simply to bring the characters to theaters, the production chose one of the manga’s most popular arcs and expanded it into a large-scale cinematic adventure.
Why the Chiikawa Movie Looks Cute but Isn’t Always Cute
One of the most interesting aspects of Chiikawa is the contrast between its character designs and its storytelling.
Chiikawa, Hachiware, and Usagi look like small, adorable mascots.
However, their world can be surprisingly dangerous.
The characters sometimes face monsters, difficult jobs, food shortages, dangerous creatures, and emotionally heavy situations.
The Siren Arc is a particularly strong example of this contrast.
The characters travel to what initially appears to be a fun destination, but the story gradually introduces danger and mystery.
This has led many viewers to describe Chiikawa as much darker than its cute appearance suggests. International coverage of the movie has also highlighted the contrast between its kawaii visual style and its unexpectedly serious themes.
Chiikawa, Hachiware and Usagi Remain the Heart of the Film
The movie’s emotional center is the friendship between the three main characters.
Chiikawa
Chiikawa is the central character of the franchise.
Although often timid and easily frightened, Chiikawa repeatedly finds the courage to help friends and face difficult situations.
Hachiware
Hachiware is one of Chiikawa’s closest friends and is generally more cheerful and optimistic.
His positive attitude often provides a contrast to Chiikawa’s nervous personality.
Usagi
Usagi is the most unpredictable member of the trio.
With energetic behavior and a distinctive way of speaking, Usagi often brings comedy to even the most serious situations.
Together, the three characters form the emotional core of the Chiikawa series.
4DX Screenings Turned the Adventure Into an Attraction
The theatrical experience has also been expanded through special screenings.
Beginning on September 5, 2026, the movie received nationwide 4DX screenings. These presentations use moving seats and environmental effects such as wind and water to make viewers feel more physically involved in the action.
For a movie centered around an island adventure, 4DX is a natural fit.
Audiences can experience movement and environmental effects while watching Chiikawa and his friends travel through the mysterious island setting.
This helped transform the movie from a conventional screening into more of an immersive event.
Fans Can Also Cheer During Special Screenings
The film’s theatrical run has included special cheering screenings, allowing audiences to react vocally during the movie.
The first round of these interactive screenings began on September 11 at selected theaters.
A further special screening using automatically controlled penlights was scheduled for September 23, with the lights changing colors in synchronization with characters’ appearances and actions.
These events are unusual because Japanese movie theaters traditionally encourage audiences to remain quiet during regular screenings.
The special Chiikawa events instead encourage fans to participate and cheer, creating a concert-like atmosphere around the film.
Why the Movie Keeps Bringing Audiences Back
The film’s strong performance cannot be explained by its opening weekend alone.
One factor has been the continued effort to make the theatrical experience feel like an event.
In addition to the standard screenings, the film has received:
- IMAX presentations
- 4DX screenings
- Cheering screenings
- Penlight-based interactive screenings
- Special admission bonuses
- Additional promotional campaigns
- New promotional artwork and stills
These additions can encourage repeat visits and help keep the film visible on social media.
The franchise’s large merchandise ecosystem also gives fans another reason to remain engaged with the movie.
Chiikawa’s First Movie Has Become a Franchise Milestone
Before the film was released, there was already considerable interest in seeing how Chiikawa would perform as a feature-length theatrical project.
The franchise had already become one of Japan’s most recognizable character properties.
However, a theatrical movie requires a different level of audience commitment.
People have to buy a ticket and spend more than an hour watching a single story rather than consuming short episodes or social-media posts.
The fact that more than 10.8 million people have now seen the film demonstrates the enormous reach the franchise has achieved.
From Social Media Illustrations to a ¥15.84 Billion Movie
The history of Chiikawa makes the achievement even more striking.
Nagano initially developed Chiikawa through short illustrations and manga posted online.
The characters gradually gained a large following, leading to books, merchandise, animation, collaborations, games, and other forms of media.
The television anime further increased the franchise’s visibility.
Eventually, Chiikawa reached the big screen.
The journey from short online illustrations to a ¥15.84 billion theatrical film is one of the most notable character-franchise success stories in recent Japanese entertainment.
The Anime Helped Build a Wider Audience
The television anime has played a major role in making Chiikawa and its friends recognizable to a broad audience.
The anime began airing in Japan in April 2022, bringing the characters’ short stories to television and streaming audiences.
The franchise has also accumulated hundreds of millions of views through official online video distribution, demonstrating how the series has expanded beyond traditional television audiences.
This existing audience created a strong foundation for the theatrical film.
At the same time, the movie introduced the world of Chiikawa to people who may have known the characters as merchandise or social-media icons but had never watched the anime.
The Movie’s Success Surpassed a Major Conan Benchmark
One of the most notable comparisons is with Detective Conan: The Million-dollar Pentagram.
Released in 2024, the Conan movie earned approximately ¥15.8 billion, making it the highest-grossing film in the long-running Detective Conan movie franchise at the time.
Chiikawa: The Secret of Mermaid Island has now moved past that figure with ¥15.84 billion.
That does not mean Chiikawa has overtaken every Detective Conan film in every historical ranking context, but it has surpassed the series record previously held by The Million-dollar Pentagram.
The result is especially noteworthy because Detective Conan has released theatrical films regularly since 1997 and has a large established audience.
Chiikawa is only beginning its theatrical history.
Chiikawa Is Now No. 1 Among 2026 Releases
The latest total also gives Chiikawa the top position among films released in Japan during 2026 so far.
Earlier in the year, Detective Conan: Fallen Angel on the Highway held the top position after reaching approximately ¥13.7 billion.
Chiikawa subsequently passed that figure and has continued climbing to ¥15.84 billion.
The result makes the film one of the defining box-office stories of 2026.
It also reinforces a broader trend in Japan’s movie industry: animated films are attracting audiences across very different demographics and genres.
The New Stills Celebrate the Film’s Success
Following the ¥15.84 billion milestone, the film’s official team released new still images featuring Chiikawa, Hachiware, and Usagi.
The images show the characters enjoying moments from their adventure and highlight their friendship and excitement.
The official message thanked everyone who had supported the movie and encouraged audiences to continue watching for future developments surrounding the film.
For fans, the release of new stills is another way to celebrate the movie’s growing box-office record while the theatrical run continues.
Why Chiikawa’s Box Office Success Matters
The film’s success matters for several reasons.
First, it demonstrates the commercial power of the Chiikawa brand.
Second, it shows that a movie does not necessarily need to come from a decades-old anime franchise to become a major theatrical event.
Third, it highlights the growing importance of social-media-driven character properties in Japan’s entertainment market.
And finally, it shows that audiences are willing to support animated films that combine cute characters with more complicated stories.
What Makes Chiikawa Different From Other Anime Movies?
Many major anime movies are based on action series, manga franchises, or long-running television shows.
Chiikawa takes a different approach.
Its appeal is based heavily on:
- Character personality
- Friendship
- Short-form storytelling
- Humor
- Merchandise
- Social-media popularity
- Emotional moments
- Unexpectedly dark story developments
The movie brings all of those elements together in a larger adventure.
That makes its ¥15.84 billion result especially interesting when compared with traditional blockbuster anime properties.
Is Chiikawa Movie Still Showing?
Yes. The film’s theatrical run has continued beyond its initial release, with special screenings helping maintain interest.
The movie has already received 4DX screenings and special audience-participation events. A penlight screening is also scheduled for September 23, 2026, at selected theaters.
Because theatrical schedules can vary by location and change over time, audiences should check individual theater listings before planning a visit.
Chiikawa: The Secret of Mermaid Island has officially become one of the biggest anime movie successes of 2026.
After just 59 days, the film has attracted approximately 10.857 million viewers and earned ¥15.84 billion in Japan. That result makes it the No. 1 film released in Japan in 2026 so far and puts it ahead of the approximately ¥15.8 billion earned by Detective Conan: The Million-dollar Pentagram, previously the highest-grossing movie in the Detective Conan franchise.
The movie’s success began with an extraordinary opening. It earned approximately ¥990 million on its first day and ¥2.24 billion during its first three days, following a nationwide release across 447 theaters.
Since then, the film has continued attracting audiences through its popular Siren Arc story, IMAX presentations, 4DX screenings, cheering events, special bonuses, and other theatrical promotions.
Perhaps the most remarkable part of the story is where Chiikawa came from.
What began as Nagano’s simple online illustrations has developed into a huge multimedia franchise—and now its first movie has earned more than ¥15.84 billion at the Japanese box office.
For a series built around three small characters named Chiikawa, Hachiware, and Usagi, that is an enormous achievement.
And with the movie’s theatrical run continuing, the Chiikawa movie box-office record could climb even higher before its final run comes to an end.
