Chiikawa the Movie: The Secret of the Mermaid Island opens in theaters nationwide on Friday, July 24, 2026. The film is the first movie adaptation of Chiikawa, the hit character series created by illustrator Nagano, which has grown its fanbase largely through social media and is now loved not only in Japan but around the world.
To celebrate the film's release, the City of Yokohama, the Yokohama Convention & Visitors Bureau, and Yokohama Minatomirai 21 have signed a partnership agreement with Chiikawa and are launching a series of city-wide initiatives called the "Chiikawa the Movie: The Secret of the Mermaid Island in Yokohama City" collaboration, running from Friday, July 24 through Sunday, August 2, 2026.
Details have now been finalized for an original sticker giveaway campaign, photo spots around the city, and special collaboration fireworks, adding up to plenty of exciting ways to enjoy Chiikawa and friends while exploring town. Catch the movie, then head to Yokohama to feel the sea breeze and make memories with Chiikawa and friends.
"Stamp-Style" Original Sticker Giveaway — Four Designs
Guests who order a designated menu item or use a designated service at participating locations will receive an original "stamp-style" sticker.
The stickers come in four special designs, each featuring Chiikawa, Hachiware, Usagi, or Siren set against a backdrop of the Yokohama cityscape. With a look inspired by postage stamps, they make the kind of cute travel keepsake you'll want to bring home.
Collect all four while exploring Yokohama, and enjoy touring the city and completing the set together with Chiikawa and friends.
Period: Friday, July 24 to Sunday, August 2, 2026
Participating Locations by Character:
| Character | Participating Locations |
|---|---|
| Chiikawa | BASEGATE Yokohama Kannai / Yamashita Park Street Shopping Association / Yokohama Marine Tower / Yokohama Motomachi Shopping Street |
| Hachiware | Rakushisu Front / Yokohama Red Brick Warehouse / Yokohama Osanbashi International Passenger Terminal |
| Usagi | Yokohama Cosmo World / YOKOHAMA AIR CABIN / Yokohama World Porters / Yokohama Hammerhead |
| Siren | CIAL Sakuragicho / Colette Mare / Minato Mirai Tokyu Square / Queen's Square Yokohama |
Details on the specific participating stores for the original sticker giveaway will be announced at a later date.
Yokohama Cosmo World and YOKOHAMA AIR CABIN participate only through Friday, July 31.
Yokohama Marine Tower is closed on Monday, July 27.
How to Receive a Sticker: Guests receive one sticker for each designated menu order or service use at a participating location.
While supplies last.
Chiikawa Photo Spots Popping Up Around Yokohama
Photo spots featuring the Chiikawa characters are appearing throughout the city of Yokohama. Chiikawa, Hachiware, Usagi, and other characters will show up at various locations around town, creating plenty of spots you'll want to stop and take a photo with.
Enjoy touring Yokohama while taking photos with Chiikawa and friends along the way.
Period: Friday, July 24 to Sunday, August 2, 2026
Planned Locations:
CIAL Sakuragicho / Colette Mare / Queen's Square Yokohama / YOKOHAMA AIR CABIN / Yokohama World Porters / Yokohama Hammerhead / Rakushisu Front / Yokohama Red Brick Warehouse / Yokohama Osanbashi International Passenger Terminal / BASEGATE Yokohama Kannai / Yamashita Park Street Shopping Association / Yokohama Marine Tower / Yokohama Motomachi Shopping Street
Details on the exact placement of each photo spot will be announced at a later date.
YOKOHAMA AIR CABIN participates only through Friday, July 31.
Yokohama Marine Tower is closed on Monday, July 27.
Special Collaboration Fireworks Light Up the Night Sky
To mark the "Matsukiyo Cocokara Chiikawa Extra-Special Summer Campaign," a special sponsorship from Matsumotokiyoshi and Cocokara Fine starting Thursday, July 16, a five-minute fireworks display called "Yokohama Night Flowers x Yokohama Green Expo" will color the night over Yokohama Port. The show will feature effects in yellow and pink — the two companies' brand colors — along with fireworks shaped after Chiikawa, Hachiware, and Usagi, lighting up the summer night sky.
Enjoy Yokohama's fireworks, filled with cuteness, under the city's night sky.
Launch Site: Shinko Pier
Date and Time: Saturday, July 25, 2026, 7:30 PM to 7:35 PM
Website: https://www.yokohama-nightflowers.com/
Entry to Hammerhead Terrace, Deck, and Park will not be permitted on the day of the event.
The fireworks can also be viewed from surrounding areas outside of Hammerhead Terrace, Deck, and Park. For details on viewing locations, please see the following site:
https://www.welcome.city.yokohama.jp/hottopics/nightflowers/
"Chiikawa" Fireworks Viewing Party — An Evening to Enjoy Together
To celebrate the theatrical release of Chiikawa the Movie: The Secret of the Mermaid Island, an event featuring Chiikawa, Hachiware, and Usagi has been decided, giving guests a chance to enjoy the special collaboration fireworks together with the characters.
Date and Time: Saturday, July 25, 2026, 7:25 PM to 7:50 PM
Application Period: Thursday, July 9, 2026, 1:00 PM to Sunday, July 12, 2026, 11:59 PM
Location: Hammerhead Park (2-14-1 Shinko, Naka-ku, Yokohama, Kanagawa)
How to Apply: Applications are by lottery. Please check the event website for details.
Participation Fee: Free
Website: https://chiikawa.toho-movie.jp/news/page/n_260709fw.html
Event Inquiries: Event Office: 050-8892-0084 (weekdays, 11:00 AM to 5:00 PM)
The time and content may change at short notice due to weather or other circumstances.
Phone inquiries cannot be accepted on the day of the event.
Collaboration Campaign Special Site Now Open
A special site for the "Chiikawa the Movie: The Secret of the Mermaid Island in Yokohama City" collaboration has opened within the "Yokohama Tourism Information" website. More details on the collaboration will be added there over time, alongside plenty of other information to help you get the most out of your visit to Yokohama.
Special Site: https://www.welcome.city.yokohama.jp/hottopics/chiikawa/
About the Film: Chiikawa the Movie: The Secret of the Mermaid Island
Chiikawa's first-ever movie adaptation began as a series of posts on X (formerly Twitter) by illustrator Nagano. Since the series began, it has rapidly grown in popularity, spawning numerous merchandise lines and collaborations and spreading throughout Japan. Its popularity shows no signs of slowing, having won the "Japan Character Awards Grand Prix" four times, with the short anime series that began airing in 2022 surpassing 400 million catch-up views on YouTube — making it a beloved franchise not just in Japan, but around the world.
The film adapts what's known as the "Siren Arc," a long-running storyline that repeatedly trended on social media with each new installment, and one of the series' most popular episodes. Production is by SAIPIKU, known for its high-quality animation, including the striking action sequences in 劇場版『ウマ娘 プリティーダービー 新時代の扉』. Under Nagano's full supervision, the adventures of Chiikawa and friends are brought to life with sweeping music and powerful visuals.
Story: One day, while Chiikawa and Hachiware are relaxing in the plaza, a rabbit-like character suddenly appears with a flyer stuck to its face. When Hachiware checks the flyer, it turns out to be an invitation reading "You're invited to a special island." Lured in by phrases like "Take on an easy subjugation quest for 100 times the reward" and "Limited island ramen and limited sweets, sweet and spicy, all virtually free," Chiikawa and friends decide to go on a training camp to the island. Together with a suspicious otter who doubts the flyer's claims, they board a ship and land on the island — but what awaits them there?
Official movie website: https://chiikawa.toho-movie.jp/
