BODY: The most disarmingly cute characters in Japan are about to take over one of its biggest port cities.
On the news that Yokohama in Kanagawa Prefecture will host a collaboration event tied to the film Eiga Chiikawa: Ningyo no Shima no Himitsu (Chiikawa: Secret of the Mermaid Island), fans of Nagano's wildly popular character franchise have a new summer pilgrimage to plan. The event opens July 24 and runs through August 2, 2026.
Chiikawa—short for "something small and cute" (nanka chiisakute kawaii)—began as a web manga and exploded into a merchandising and media juggernaut, spawning an anime, mountains of goods, and now a feature film. The tie-up with Yokohama leans naturally into the Mermaid Island theme: a seaside city with a famous waterfront is an almost too-perfect backdrop for a story set among mermaids.
While full programming details are still rolling out, city collaborations like this typically bundle limited-edition merchandise, themed photo spots, stamp rallies across local landmarks, and venue decorations featuring Chiikawa, Hachiware, and Usagi. Yokohama's Minato Mirai district and surrounding tourist zones are the likely staging grounds, turning a casual day trip into a character-hunting outing.
The insider take
From Tokyo, the more interesting story is the machinery behind these events. Japanese municipalities have learned that anchoring a tourism campaign to a beloved IP—Chiikawa especially—reliably draws domestic visitors and their wallets during peak summer travel season. Yokohama is an easy half-hour from central Tokyo, making it a low-friction destination for the franchise's core fanbase: adults who grew up adjacent to character culture and now spend seriously on nostalgia-tinged cuteness. Expect merchandise to sell out fast and resale listings to appear within hours; that secondary-market churn has become an unspoken feature of every major Chiikawa drop here.
Originally reported by GAME Watch (Japanese).