I Looked Into Nanjoen Ryokan
2026-09-04
In Komorin's Imaginary Travels, I've been researching various types of accommodations in a series, mainly focusing on campsites and day-use hot springs. This time, I decided to switch things up a bit and look into a hot spring ryokan.
This time, I looked into "Nanjoen Ryokan," located in Kurokawa Onsen in Kumamoto Prefecture. Kurokawa Onsen is an area known for the atmosphere of the entire hot spring town, but I came across the catchphrase "lowest prices for online and phone reservations" for this particular inn, which caught my interest, so I decided to look into it further.
It seems to be an inn in Kurokawa Onsen that advertises some of the lowest rates for online and phone reservations, with rooms featuring free-flowing natural hot spring baths available as an option.
As for signal strength, the official tool didn't even display a result, so I wasn't able to confirm it.
I've summarized the details below.
What Kind of Inn Is Nanjoen?
Apparently, Nanjoen is a ryokan in Kurokawa Onsen, located in Minamioguni, Aso District, Kumamoto Prefecture. Kurokawa Onsen is famous for the style of strolling around the whole hot spring town in a yukata, and this inn also seems to be located within that hot spring town. Looking at the official website, the catchphrase "lowest rates for online and phone reservations in Kurokawa Onsen" stands out, so it seems there may be cases where booking through the official channel works out cheaper than going through external booking sites.
Apparently, reservations can be made by phone (accepted from 10:00 AM to 9:00 PM) as well as through the online reservation page on the official website. It also seems possible to book through external reservation sites like Jalan, Rakuten Travel, Booking.com, and Expedia, but what stood out to me was that the official site states "reservations via the website or by phone offer the lowest rates." Incidentally, while a contact email address is provided, it's clearly stated that reservations themselves are not accepted by email, so it seems best to use the phone or the reservation form to be safe. Reservations are apparently accepted up until the end of the month, six months in advance, which might make it convenient when planning a trip a bit further out.
As for the rates, which are naturally of interest, according to the estimate listed on the official website of the Kurokawa Onsen Ryokan Cooperative, a one-night stay with two meals runs roughly 19,000 to 33,000 yen per person, before tax. That said, specific pricing isn't listed on the official site itself, so it seems you'd need to check through a booking site to confirm.
Checking Out the Room Types
The rooms seem to be divided into three main categories. One is a room with a private free-flowing natural hot spring bath (an 8-tatami-mat room plus a 6-tatami-mat room plus a wide veranda), which seems suited for those who want to enjoy the hot spring right in their room. Another is a standard room (a Japanese-style room of 7.5 to 10 tatami mats plus a wide veranda), which appears to be the standard type. There's also a standard room in the annex (a 12-tatami-mat Japanese-style room plus a 5-tatami-mat wide veranda), which seems well-suited for those who want to relax in a more spacious room.
Details like the exact check-in and check-out times, whether parking is available and how many spaces there are, and the number of rooms weren't listed on the official site, so it seems you'd need to inquire at the time of booking to confirm. As someone who's very much an indoor type, I'd like to at least know the differences between room types in advance, so I felt it would be nice if a bit more information were available here.
Having a room with its own free-flowing natural hot spring is pretty appealing to me, since I'm the type who doesn't want to step outside the room at all. Still, not knowing the check-in time makes it a little hard to plan around.
If I Were to Walk Around the Surrounding Hot Spring Town (Hypothetically)
According to the official website of the Kurokawa Onsen Ryokan Cooperative, the hot spring town has food spots such as Hanakarafu, Tofu Kissho, and the Kurokawa branch of Mochiyaki Senbei Terakoya Honpo (the name is written slightly differently across sources). There's also apparently a scenic spot called Nabegataki Falls a bit further out. That said, the sources don't specify exact distances or walking times from Nanjoen to these places, so this is just general information about the Kurokawa Onsen area as a whole. Since Kurokawa Onsen itself is said to be an area you can get around on foot, heading out from the inn to explore the hot spring town doesn't seem like it would be too much trouble. There also seems to be a bus stop within the hot spring town, so I feel like it might be fairly accessible even for someone like me who doesn't drive.
Rakuten Mobile Signal Conditions
When I checked this facility's location using the official "My Area Communication Simulation" tool, the result itself didn't display, and instead I got a message along the lines of "currently undergoing temporary maintenance." This message apparently appears when address data for the location in question isn't available, so honestly, this time I simply wasn't able to determine whether the signal was good or bad.
Given that it's located in a hot spring area nestled in the mountains, signal conditions might vary quite a bit depending on the exact spot. For this investigation, the result simply came back as "unknown."
This is the first time I've seen a case where the signal check didn't produce a result at all. Since the ryokan itself seems to have such a nice atmosphere, this one point left me feeling a bit frustrated.
