Came to stay mainly for the demon slayer vibes. Enjoyed the performance and it was beautiful! Dinner was great. Food was good and service was good. They explained everything and able to enjoy myself fully. Breakfast buffet was nice, and I enjoyed myself with the selection.

I didn't like how the open bath during the evening was only for private reservation. You can only use them in the morning which was a shame.

The staff were extremely friendly and very customer service oriented. The room and facilities were of extremely high quality - I felt as if I was in a 5 star hotel. The dinner was perfect. Hot springs are very pleasant.

The breakfast, though high quality, was not to my taste - It was traditionally Japanese and there were no other choices available. The buses were not easily available, and I had to take a rather expensive taxi from Aizuwakamatsu as it was getting late when we arrived via train there.

Ookawaso was a great stay. The kaiseki dinner is fantastic and the shamisen performance in the evening is great as well. There is a sake bar where you can fill your own glass of sake in exchange for coins which was very convenient when drinking lots of it. One of the staff members can speak perfect english since she was born in the Philippines and she was really lovely and made sure we had a great time. The onsen facility is great but the private outdoor onsen is not worth it - super hot so we couldn't get in it after booking it for an hour. no option to mix cool water into the pools which was a real bummer. They provide a free shuttle directly to aizu wakamatsu station which was great for us. Overall great stay

Private onsen is way too hot and you can't adjust the temperature

breakfast was good with quite a bit of choices. Was very surprised at how good the croissants were, as good as those I had before in Paris. Something different was the 'Egg fried rice' which was whipped egg whites on yummy rice and a raw yolk. Definitely should try the Outdoor bath, its beautiful.

the trains and buses were not very frequent so need to time your activities well, otherwise taking the taxi can be quite expensive. But the hotel makes up for it by offering free shuttles and transfers at Aizu-wakamatsu and Ashinomaki onsen stations, reservations required though

Simpy WOW! It is really an amazing place. We stayed there for one night just to get the experience in staying in a ryokan with onsen. We like anime so we chose this one as it has some features of Demon Slayer anime :) Room was amazing, sleeping on futons was really comfortable. Room was spacious. We were wearing yukatas during our stay and it was just amazing! Onsen was wonderful! And the dinner - OMG - super tasty! we felt really welcomed there and taken care of. One staff member who spoke English very well was explaining us what we were eating, how to cook different parts of the meal etc. It was so lovely. We really appreciate that! If we ever come to Japan again we will go there for sure.

This is an impressive onsen hotel. All rooms face the natural mountain side above a fast moving river. The lobby is exceptional with live traditional shamisen music played nightly before the dinner hour. A river of water cascades through the ground floor of the lobby which adds the sound of rustling water. Guests may have (optional reserved) dinner meals in rooms near the moving water. All in all the lobby, onsen, food, and staff make for a relaxing location. The river views in any season are amazing.

All rooms have not been refreshed and we found ourselves in a room the first night which was dated. The following day I convinced the hotel to move us to a different room which was really impressive and all amenities were new. The view was nearly identical since all rooms face the same mountain.

Beautiful ryokan, there's traditional music performance at the centre of the lobby from 4pm-6pm. The manga/anime Demon Slayer infinity castle based on this hotel. Well presented and tasty kaiseki dinner, good selection of breast buffet and great customer service. Available yukata that fit all sizes including baby/toddler (very cute). Spacious Japanese room with river view, although the facilities/furnitures are quite old. Interesting public bath with three tiers open bath with river/mountains view. Not so convenient to travel on public transport, but great with rental car to get there.

Outdated facilities/furniture, selection of amenities can be improved.

I came here as a Demon Slayer fan as the hotel is said to have inspired the Infinity Castle in the series. I absolutely loved the grand lobby with the traditional performance! As a vegan guest, the staff went above and beyond to help me make sure everything I eat is safe. I must say the short haired lady with glasses (sorry forgot her name) who speaks fluent English made me feel really at home. Thank you for the lovely experience.

Maybe more vegan friendly options for breakfast buffet with clearly labeled ingredients list would be helpful for guests with dietary restrictions.

To make it simple, everything! The staff is very careful, we feel the will to do well and the Japanese know-how! The room was just amazing, the view breathtaking! The dinner was amazing too, the dishes scroll non-stop for 1 hour, special mention to the waitress who took care of us she was more than perfect! We ended our evening with a private onsen, as a couple, it was perfect Thanks to the staff for doing such a good job

Nothing

Authentic Japanese experience, which we would not have been able to access without our Japanese speaking daughter accompanying us. Everything was meticulously presented from the room to the dinner and the staff were very helpful. The access to booking a private onsen was very appreciated.

Not terribly geared to Westerners. A staff member with good English speaking skills would help non Japanese speaking guests. For example, we did not want to eat horsemeat which was organised for our dinner but this was difficult to communicate. In saying that, the staff were very accommodating once the language barrier was overcome.