Hakone Kowakien Yunessun, the all-weather onsen theme park in Hakone, Kanagawa, will host a special collaboration event — "Demon Slayer: Kimetsu no Yaiba × Yunessun — Hakone Onsen Tale: Rest of Wisteria Flowers" — from July 18, 2026 (Saturday). The park, which celebrated its 25th anniversary on January 1, 2026, is bringing the world of Demon Slayer: Kimetsu no Yaiba to life this summer, offering a fully immersive experience including themed baths, a collaboration sauna, and exclusive merchandise.
The event coincides with Demon Slayer: Kimetsu no Yaiba — The Movie: Infinity Castle Arc Chapter 1: Akaza's Return, which surpassed 40 billion yen at the Japanese box office following its July 18, 2025 release.
Event Overview
Event Name: Demon Slayer: Kimetsu no Yaiba × Yunessun — Hakone Onsen Tale: Rest of Wisteria Flowers
Period: July 18 (Sat) – October 4 (Sun), 2026
Contents: Collaboration bath, collaboration sauna, collaboration tickets, collaboration drinks, collaboration merchandise, collaboration rooms, collaboration accommodation plans, and more
Details are subject to change or cancellation without prior notice.
Exclusive Drawn Illustrations by ufotable
Five characters have been depicted in new yukata-style artwork created exclusively for this event by ufotable, showing them enjoying Hakone Kowakien.
Characters: Tanjiro Kamado, Zenitsu Agatsuma, Giyu Tomioka, Shinobu Kocho, Kanao Tsuyuri
Collaboration Rooms at Hakone Hotel Kowakien
The adjacent official hotel, Hakone Hotel Kowakien, will offer the property's first-ever collaboration rooms this summer, featuring limited novelty items exclusive to guests.
Period: July 18 (Sat) – October 4 (Sun), 2026
Reservations Open: June 11, 2026 (Thu), 10:00 AM
Room pricing, design, and included benefits will be announced at a later date.
About Demon Slayer: Kimetsu no Yaiba
Demon Slayer: Kimetsu no Yaiba is based on the manga by Koyoharu Gotouge, published in Shueisha's Jump Comics volumes 1–23, with cumulative print runs exceeding 220 million copies. Animation is produced by ufotable.
The story follows Tanjiro Kamado, a young boy whose family is killed by demons, as he joins the Demon Slayer Corps in hopes of returning his sister Nezuko — who has been turned into a demon — back to human form. The TV anime series began broadcasting in April 2019, with the theatrical feature Demon Slayer: Kimetsu no Yaiba — The Movie: Mugen Train following in October 2020. Additional TV anime arcs continued through 2024, and on July 18, 2025, Demon Slayer: Kimetsu no Yaiba — The Movie: Infinity Castle Arc Chapter 1: Akaza's Return opened in theaters across 158 countries and regions, with a Blu-ray & DVD release scheduled for July 29, 2026. A full rebroadcast of the TV anime series has also been airing since April 5, 2026.
Further event details will be announced via the official website and social media as information becomes available.
Official Website: https://kimetsu.com/
Yunessun Official Website: https://www.yunessun.com/
