"Chiikawa The Movie: The Secret of the Mermaid Island" x Sunflower Collaboration "A Relaxing Cruise" to be Held in August

The collaboration event "Chiikawa x Sunflower: A Relaxing Cruise with Chiikawa" will begin with departures on Thursday, August 6, 2026.

"Chiikawa" is a popular manga that illustrator Nagano has been posting on X (formerly Twitter) since 2020. Chiikawa The Movie: The Secret of the Mermaid Island is the series' first theatrical film, depicting a long-form story known as the "Siren Arc" written by Nagano specifically for the movie. This long-awaited adaptation brings to the screen one of the most popular episodes of the series, which frequently trended on social media as each chapter was released.

The event will feature plans that allow passengers to enjoy their travel time while immersing themselves in the world of Chiikawa, as well as sales of original Sunflower collaboration merchandise.

In Chiikawa The Movie: The Secret of the Mermaid Island, characters are depicted traveling to an island by boat. By overlapping the movie's world with a ferry journey, the project aims to make the charm of the work and boat travel feel more enjoyable and accessible. Through this initiative, traveling on the "Sunflower" ferry becomes a destination in itself, offering many passengers a new way to appreciate the allure of sea travel.