In Aizu-Wakamatsu, Fukushima, lies Ashinomaki Onsen Ookawaso, a ryokan often called the real-life model of the Infinity Castle from Demon Slayer. With its grand atrium lobby and the hauntingly beautiful live shamisen performance, this ryokan transports visitors into a world that feels straight out of the anime.
What is Ookawaso?
Ookawaso is one of the most iconic hot spring ryokans in Aizu. Built along a gorge, the ryokan harmonizes with nature and offers spectacular views throughout the four seasons. Guests can enjoy hot springs fed directly from the source, seasonal local cuisine, and heartfelt hospitality.
The highlight is the atrium-style lobby. Multiple layers of walkways and structures create a dynamic architectural space that impresses guests and offers a sense of the extraordinary. The décor throughout the ryokan blends traditional Japanese aesthetics with modern comfort.
Another unique feature is the live shamisen performance. The sound of the shamisen fills the lobby in the evening, creating a serene and immersive atmosphere that few other ryokans can provide. This experience is one of the reasons why the place is linked to the Infinity Castle.
Why it is said to resemble the Infinity Castle
The atrium lobby structure
In the story of Demon Slayer, the Infinity Castle is Muzan Kibutsuji’s lair, a surreal multi-dimensional space with shifting rooms and staircases. The atrium lobby of Ookawaso, with its layered and interwoven design, strongly recalls the Infinity Castle. Looking upward reveals multiple balconies and corridors that seem endless, leaving visitors with a sense of awe.
The live shamisen performance
In the series, the demon Nakime controls the Infinity Castle by playing the biwa, filling the space with tension and mystery. At Ookawaso, the sound of the shamisen echoes through the ryokan and evokes memories of that iconic scene. Many guests have commented on social media, saying it felt like they had stepped directly into Muzan’s domain.
Why it is popular among fans
Fans do not visit just because the building looks similar. The real appeal lies in the multi-sensory experience that allows them to feel immersed in the world of Demon Slayer.
Common points between Ookawaso and the Infinity Castle
| Highlight | Connection with the series |
|---|---|
| Atrium structure | Resembles the layered Infinity Castle |
| Shamisen performance | Reminds of Nakime’s performance scene |
| Luxurious interior | Evokes Muzan’s majestic lair |
| Quiet gorge setting | Feels like an otherworldly realm |
In addition to these similarities, the ryokan itself offers high-quality services. Even visitors who are not fans of the series will find the stay deeply satisfying thanks to the hot springs, food, and ambiance.
The hot springs and cuisine of Ookawaso
The hot springs are natural and fed directly from the source, allowing guests to soak while gazing over the gorge. Seasonal scenery makes the outdoor baths special—spring blossoms, summer greenery, autumn foliage, and winter snowscapes.
Meals showcase seasonal Aizu ingredients. The chefs highlight the flavors of the region through carefully prepared menus.
Seasonal dishes at Ookawaso
| Season | Example dishes |
|---|---|
| Spring | Mountain vegetables, cherry blossom sea bream |
| Summer | Grilled ayu fish, simmered summer vegetables |
| Autumn | Matsutake mushroom dishes, local mushroom hot pot |
| Winter | Duck hot pot, stewed snow-stored vegetables |
Through both food and bathing, guests can experience the cultural richness of Aizu.
Enjoying Aizu sightseeing alongside the ryokan
Visitors to Ookawaso should also take time to explore the historic and cultural sites of the Aizu region.
Major sightseeing spots in Aizu
| Spot | Features |
|---|---|
| Tsuruga Castle | Historical castle tied to the Boshin War |
| Aizu Samurai Residence | Facility showcasing Edo-period samurai life |
| Byakkotai Memorial Museum | Exhibits about the young Byakkotai warriors |
| Ouchi-juku | Edo-period post town preserved as a tourist site |
Many fans begin their trip with a pilgrimage to Ookawaso, but end up falling in love with Aizu’s broader cultural and historical heritage.
Access and lodging tips
Ookawaso is about a 30-minute drive from central Aizu-Wakamatsu City. From Tokyo, travelers can reach it via the Shinkansen and local train lines, making it a convenient destination even from the capital.
Tips for staying at Ookawaso
| Checkpoint | Details |
|---|---|
| Room choice | Gorge-side rooms offer the best views |
| Reservations | Book early during popular seasons |
| Special perks | Some plans include close-up shamisen performances |
| Surroundings | Scenic gorge walks near the ryokan |
Conclusion
Ashinomaki Onsen Ookawaso is a ryokan that many consider to be a real-life Infinity Castle from Demon Slayer. Its atrium lobby and shamisen performances create an atmosphere that lets visitors step into the series’ world.
Beyond its connection to Demon Slayer, the ryokan also allows travelers to enjoy Aizu’s history, nature, and food culture, making the visit rewarding for both fans and general tourists alike.
Ultimately, Ookawaso is not just a lodging facility. It is a stage where fiction and reality overlap, enchanting all who enter.
