What this is
Rilakkuma × Joetsu Aquarium Umigatari 'Umi Rila Kibun' is the first-ever collaboration event between the beloved San-X character Rilakkuma and a Japanese aquarium. Running from late June through late September 2026, the event transforms Joetsu Aquarium Umigatari in Niigata Prefecture into a seaside Rilakkuma wonderland. The theme 'Umi Rila Kibun' — roughly translating to 'Ocean Rilakkuma Feeling' — imagines Rilakkuma and friends unwinding by the beautiful sea. The event features original artwork panels, plush photo displays, and a collectible stamp rally throughout the aquarium.
Who should go
This event is perfect for Rilakkuma fans of all ages, families with young children, and anyone who enjoys combining cute character culture with a genuine aquarium experience. The relaxed, summery atmosphere makes it ideal for a leisurely day out, and the stamp rally adds a fun interactive element for kids and collectors alike. Anime and kawaii merchandise enthusiasts will appreciate the exclusive acrylic keychain novelty available to stamp rally completers. Arrive early in the day to avoid crowds and to maximise your chances of securing stamp rally novelties before supplies run out.
Good to know
Joetsu Aquarium Umigatari is a mid-sized regional aquarium in Niigata Prefecture — tickets can typically be purchased at the venue box office on the day, and cash is recommended as card acceptance at smaller regional venues can be limited. The stamp rally novelty (an original acrylic keychain) is available while supplies last, so visiting earlier in the event period — or earlier in the day — gives you the best chance of receiving one. The event runs across the full summer season, making weekdays significantly less crowded than weekends and school holiday peaks in late July and August. Foreign visitors should note that Joetsu is roughly 2–2.5 hours from Tokyo by Hokuriku Shinkansen to Joetsumyoko Station, so plan this as a day trip or combine with an overnight stay in the region.
This event was sourced and translated from Japanese by What's On Japan. Details may change — verify with the official source before attending.