Chiikawa makes its big-screen debut with a film adapting the Mermaid arc, a long-form story originally published on X by author Nagano. The film, titled 'Chiikawa Movie: Mermaid Island,' was released in Japan on July 24, 2026.
The movie captivated audiences, grossing over 15.84 billion yen in its first 59 days and ranking first among 2026 releases at the Japanese box office. The success repeated in South Korea, where it surpassed one million admissions in just ten days after its release on September 30.
The plot follows Chiikawa and friends who, drawn by a flyer, set off for a special island. There, they discover that a giant mermaid is kidnapping the local inhabitants and find themselves involved in a plan to defeat her. Nagano personally oversaw the concept for the film's opening, designed to introduce the characters to new audiences.

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