Chiikawa's first movie just posted a Conan-scale opening. Cute still prints tickets.
Chiikawa the Movie: The Secret of the Mermaid Island opened at No. 1 in Japan with about 1.51 million admissions and ¥2.24 billion in three days, after a ¥990 million opening day.
Mina Park
Japan’s weekend No. 1 did not need a mecha war or a detective.
Chiikawa the Movie: The Secret of the Mermaid Island opened July 24 across 447 theaters, including 65 IMAX screens, and took the July 24–26 box office crown. Kogyo Tsushinsha’s weekend tally put the film at roughly 1.51 million admissions and ¥2.24 billion in three days. Opening day alone cleared about ¥990 million, enough to edge past the ¥960 million first-day mark for Detective Conan: The Million-dollar Pentagram. Among 2026 Japanese anime openers it still sits behind Detective Conan: Fallen Angel of the Highway, which launched harder earlier this year. The useful read is not that Chiikawa reinvented the anime tentpole. It is that a character born on X just bought the same screening density summer audiences associate with Conan and Demon Slayer.
What actually sold
Nagano’s Chiikawa started as a web manga on X in 2020: tiny creatures, soft jokes, and a world that keeps reminding you survival is not a joke. That gap is the fandom engine. The franchise has taken Japan Character Award Grand Prix four times, the short anime’s YouTube catch-up views have crossed 500 million, and the X account sits near five million followers. Merch already traveled through China, Taiwan, and Korea storefronts. The movie is the admission receipt.
The film adapts the Siren Arc, the long island story Nagano wrote for the screen. Chiikawa, Hachiware, Usagi, and friends follow a flyer promising easy monster-hunt payouts and nearly free island ramen, then get the summer they did not budget for. Kei Oikawa directs at Cygames Pictures, with Nagano on script and full supervision. TOHO distributes. Korea already has a September theatrical date. North America still has no firm ticket window, which is the diaspora planning problem: the soft power is already on your group chat stickers while the movie is still a Japan-first event.
Our take
Treat the ¥2.24 billion as proof of conversion, not cuteness trivia. Plush-and-meme IP that fills IMAX slots is doing the same cultural job as chart music and streaming dramas, just with different packaging. Watch whether the next weekends hold after the opening stampede, and whether a U.S. or festival date shows up before the Siren Arc becomes another title diaspora fans can only track through Japanese box office screenshots. Pair with our Soft Power Index if you are mapping what Asia exports without needing a Korean headline. Our verdict: the tiny creatures just posted a grown-up opening. That is the story.
