Demon Slayer: Kimetsu no Yaiba is heading to the hot springs! Hakone Kowakien Yunessun, a popular water park and spa resort in Kanagawa Prefecture, Japan, has announced a special collaboration event titled “Kimetsu no Yaiba × Yunessun: Hakone Onsen Tale ~Rest Among Wisteria Flowers~” (箱根温泉譚 ～藤の花の休息～). The event runs from July 18 to October 4, 2026.
About Kimetsu no Yaiba
Kimetsu no Yaiba is a manga series by Koyoharu Gotouge, published by Shueisha under the Jump Comics label, spanning 23 volumes with a cumulative circulation exceeding 220 million copies worldwide. The story follows Tanjiro Kamado, a young boy who joins the Demon Slayer Corps after his family is slaughtered by demons, determined to restore his sister Nezuko — who has been turned into a demon — back to humanity.
The anime adaptation is produced by ufotable, with the first season airing in April 2019. The series is currently in the midst of a theatrical trilogy, Demon Slayer: Kimetsu no Yaiba – The Movie: Mugen-jo Arc, with Chapter One: Akaza Returns released on July 18, 2025. The film also made history as the only Japanese production nominated in the Best Animated Motion Picture category at the 83rd Golden Globe Awards.
Event Highlights
The collaboration brings the world of Kimetsu no Yaiba to life in a hot spring setting, with a wide range of activities and exclusive merchandise, including a collaboration bath, collaboration sauna, special tickets, drinks, goods, themed hotel rooms, and accommodation packages.
Collaboration Drink
A special “Wisteria Flower Demon Drink” (藤の花 邪鬼ドリンク), inspired by the “Wisteria Flower Crest House” from the series, will be available for purchase. Each buyer receives one original tag (15 designs total) at random.
Collaboration Goods
A wide selection of merchandise featuring newly drawn illustrations by ufotable will be on sale, including:
- Can badges and acrylic stands featuring characters enjoying Hakone
- Face towels and waterproof multi-cases
- A dedicated “Onsen Yukata ver.” goods line, including trading can badges, acrylic stands, locker-key-style acrylic keychains, and items inspired by milk bottle caps
Collaboration Ticket & Accommodation
A special collaboration ticket will come bundled with a novelty towel printed with the new illustrations. The adjacent Hakone Hotel Kowakien will offer themed rooms with exclusive guest novelties, as well as an accommodation plan that includes an original tenugui (Japanese hand towel).
Special Promotions
- Spend ¥2,000 (tax included) or more on goods to receive one random postcard (10 designs total)
- A Follow & Repost campaign on X (formerly Twitter) will run throughout the event period
Event Details
- Event Name: Kimetsu no Yaiba × Yunessun: Hakone Onsen Tale ~Rest Among Wisteria Flowers~
- Dates: July 18 – October 4, 2026
- Venue: Hakone Kowakien Yunessun, Kanagawa, Japan
- Address: 1297 Ninoheira, Hakone-machi, Ashigarashimo-gun, Kanagawa 250-0407
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