I Looked Into Kokoro no Oyado Jizaisou

On this blog, I don't just cover campgrounds—I also steadily research places to stop by for those times when I think, 'I want to fold up the tent today and relax at an inn instead.' My goal is to build up a stock of places where I can rest without pushing myself too hard, including day-use hot springs and long-established inns.

This time I looked into Kokoro no Oyado Jizaisou, located in the Nasu-Yumoto hot spring area of Nasu Town, Tochigi Prefecture. Nasu is an area that often comes up in conversation among camping enthusiasts, especially during the cool-summer and autumn foliage seasons, so I wanted to take a proper look at what this long-established inn is like, as well as the Rakuten Mobile signal conditions there.

What Kind of Inn Is Kokoro no Oyado Jizaisou?

Apparently, Kokoro no Oyado Jizaisou is a long-established inn in the Nasu-Yumoto hot spring area, which is said to have a history of over 1,300 years since its springs were first opened. It seems to use the same source as the one supplying the Nasu Imperial Villa, a blended spring called 'Omaru Spring, Sanraku No. 1-15 Mixed Source.' The water quality is a simple thermal spring (neutral, hypotonic, high-temperature), and it's said to be colorless and clear with a faint smell of hydrogen sulfide.

Check-in starts at 1:00 PM and check-out is by 11:00 AM, and apparently since June 2025 guests can stay for up to 22 hours. With only 15 rooms in total, it's a relatively small-scale inn, and I felt that having room types named after mountain plants was one of the distinctive touches of this place.

Bookings can apparently be made either through the reservation search on the official website or by phone. The official site doesn't seem to have a fixed price list; instead, you search by specifying your dates. On external booking sites I came across reference figures suggesting rates of roughly the ten-thousand-to-twenty-thousand-yen range per person for one night with two meals, but since that's not primary information, it's probably best to confirm the actual price at the time of booking.

Komorin

Being a long-established inn, I guess it makes sense that it's the type of place that doesn't publish a fixed price list. For someone like me who's more of an indoor type, it seems best to just tentatively pick some dates and try searching, at least as a starting point.

Guest Rooms and Hot Springs: What Appeals to an Indoor Type Like Me

The guest rooms seem to be divided into three main types. In addition to standard Japanese-style rooms without an open-air bath, the Japanese-style rooms with garden open-air baths (the Hagi, Aoi, and Kiri rooms) apparently come with an open-air bath fed by natural spring water plus a shower room. On top of that, the relaxing Japanese-style rooms with Shigaraki-ware open-air baths (the Komakusa and Gozentachibana rooms) reportedly include an open-air bath using Shigaraki pottery tubs, along with a healing stone couch sofa. As someone who's more of an indoor type, the fact that you can fully enjoy the hot springs without ever leaving your room really caught my attention.

As for shared amenities, it seems rooms come equipped with things like a 50-inch TV, a sofa, a refrigerator, and a safety box. However, I couldn't find any mention of in-room Wi-Fi on the official site, so if that matters to you, it might be worth asking about it when you book.

The large communal bath and open-air baths are apparently available from 1:00 PM to midnight, and again from 5:00 AM to 10:00 AM the next morning, with the men's and women's sides swapping at midnight. The open-air bath is also said to include a jacuzzi, a half-body soaking area, and a mist sauna. On top of that, there's a private semi-open-air bath that any guest can use, on a 30-minute reservation system booked at the front desk after check-in. There's also a wheelchair-accessible restroom and a shower chair, which gave me the impression that the inn is mindful of accessibility.

Day-use bathing is apparently also available, with reception from 1:00 PM to 6:00 PM (last entry at 5:00 PM), priced at 1,000 yen for adults and 700 yen for children. The regular closed days are said to be Wednesdays and Thursdays, though it seems day-use bathing may still be available on some of those days, so entry could be cut off depending on how crowded it gets.

Meals and the Lounge Look Like a Relaxing Way to Spend Time

For dinner, there's apparently a seasonal kaiseki course called 'A Dinner Kaiseki Coloring the Four Seasons,' using highland vegetables from Nasu, Tochigi wagyu beef, and river fish, among other ingredients. For breakfast, a Japanese-style set meal is served featuring Nasu Goyo eggs and miso soup made with three-year-aged miso. Meals are generally served in the dining hall, but it seems you can also choose an in-room dining plan for an extra fee (though apparently this isn't available for every room type).

At the first-floor lounge called 'Sora,' guests seem to be able to enjoy seasonal smoothies and snacks, a sake tasting flight, and blended coffee from a famous chocolate brand. There's also a souvenir shop, a craft corner, free massage chairs, and an ice pop service, which gave me the impression that you could spend time here not just by holing up in your room, but also simply by strolling around the building at leisure.

Rakuten Mobile Signal Conditions

I tried checking the location of this inn using the official "My Area Connectivity Simulation" tool, but no result was displayed—only a message saying "Currently under temporary maintenance." I tried several times and got the same result each time, so I wasn't able to confirm the signal conditions this time, and I'm marking this as unknown.

Since Nasu-Yumoto is a hot spring area nestled in the mountains, if signal strength is a concern for you, it might be a good idea to check the official tool yourself again as your stay approaches.

Komorin

Honestly, it's frustrating for me too when the tool just shows a maintenance message instead of giving a result, but I can't force myself to write 'it should be fine,' so I'm leaving it honestly marked as unknown.

Wrapping Up

To sum it all up, my impression of Kokoro no Oyado Jizaisou was that it's a long-established inn equipped with features that would appeal to anyone wanting to hole up in their room and fully enjoy the hot springs, such as rooms with open-air baths fed by natural spring water and Shigaraki-ware baths. I also appreciated that there are options beyond an overnight stay, like the private semi-open-air bath, the lounge, and day-use bathing plans.

On the other hand, as for the Rakuten Mobile signal conditions, even the official tool couldn't produce a result, so this time it came back as unknown. If you're planning a trip to Nasu and signal strength is a concern, it's probably a good idea to check the official tool again before you leave.

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Related Links

• Official Site