Aquaignis Yoshikawa-Minami Hot Spring (Yoshikawa, Saitama Pref.) Review 【Japan Onsen day trip vol.5】

Hello!
Currently deeply immersed in uncovering the hidden gems of Saitama Prefecture… I’m Nobuyo (@nobuyo5696)!

Saitama Prefecture is truly a treasure trove of hot springs.
Day-trip bathhouses are popping up at such a rate that it feels like every municipality has at least one, which is irresistible for hot spring lovers.

This time, I visited Aquaignis Yoshikawa MinamiYoshikawa-Minami, located in Yoshikawa City in the southeastern part of Saitama.
It’s a day-trip hot spring facility directly connected to Aeon Town Yoshikawa Minami in front of the station, reminiscent of a stylish spa.

Looking just at the location, you might get the impression, “Oh, just another super sento attached to a shopping mall,” but the unmissable point here is that Aquaignis Yoshikawa Minami actually draws natural hot spring water.
Bearing the name “Musashino Onsen,” this hot spring is a must-visit for citizens of Saitama, the Musashi Province.

Like other day-trip hot spring facilities, Aquaignis Yoshikawa Minami has a restaurant and relaxation space attached, allowing you to spend a leisurely time.
However, upon actually visiting, there were a few moments that made me go “Hmm…”, so I’ll be reporting on everything completely, including those aspects!

What is Aquaignis Yoshikawa Minami?

A stylish and modern urban hot spring facility. Here’s what Aquaignis Yoshikawa Minami is like!

Aquaignis Yoshikawa Minami is a bath facility located on the first floor of Aeon Town Yoshikawa Minami.
The town of Yoshikawa Minami itself seems to have been developed quite recently (apparently, it used to be an expanse of rice fields with no station), and the Aeon Town building itself is quite new.

Located inside a brand-new shopping mall in such an emerging new town, Aquaignis Yoshikawa Minami obviously feels fresh out of the oven.
The interior is basically clean and uncluttered, and the white-based design is refined and stylish.

The concept of Aquaignis Yoshikawa Minami is best described as an “urban spa facility.”
Day-trip hot spring facilities in Saitama tend to have a purely traditional Japanese atmosphere, but this one is characterized by a modern and urban vibe that goes to the complete opposite extreme.

More than anything else, what makes Aquaignis Yoshikawa Minami vastly different from other facilities is that it does not have a sauna.
In recent years, with the unprecedented sauna boom, every hot spring facility puts a lot of effort into their saunas, but Aquaignis Yoshikawa Minami gives off a rebellious spirit (?) saying, “Like hell we’re riding that boom!”

Aquaignis Yoshikawa Minami: Hours | Fees

The basic info for Aquaignis Yoshikawa Minami is like this.
Perhaps because there’s no sauna, a nice point is that the admission fee is on the cheaper side.

Since towels are not included in the admission fee, renting them is a good idea if you come empty-handed.
Shampoo, conditioner, and body soap are provided in the bathing area and can be used freely.

On the other hand, there are no skin lotions in the men’s changing room (maybe there are in the women’s).
If they’re using a refined spa atmosphere as a selling point, I wish they wouldn’t skimp on that and just provide some…

The system at Aquaignis Yoshikawa Minami is very convenient, as the shoe locker key serves directly as your wristband for in-facility payments.
The changing room locker key is separate, and you can choose any available locker.

It’s a post-payment system where you pay the admission fee and food/drink expenses all together when leaving, and credit cards are also accepted.
In other words, you can use the facility with absolutely no cash on hand.

It’s a pretty high-tech system up to this point, so it’s strange that ordering at the restaurant was an analog process where you order verbally at the counter.
Also, the fact that there were too few vending machines (only one in the changing room, and I didn’t see any in the relaxation space) was subtly inconvenient.

Aquaignis Yoshikawa Minami: Spring Quality | Water Supply System

What’s drawn into Aquaignis Yoshikawa Minami is a natural hot spring gushing from 1,500m underground.
The spring quality is an iodine-containing sodium-chloride strong salt spring, and the brownish, cloudy water has a quite strong salty taste.

This somewhat rare iodine-containing spring is said to have body-warming and sterilizing effects, and it leaves the skin feeling moisturized.
In particular, the “raw source lukewarm bath” in the indoor area is fantastic, with no complaints about the spring quality or temperature. The other tubs using hot spring water felt a bit diluted in both color and components, probably because water is added.

On the other hand, it’s disappointing that the hot springs at Aquaignis Yoshikawa Minami are not free-flowing, but all use a circulation system.
I can’t help but think, “Since they have a hot spring with such good quality, they shouldn’t skimp by adding water and circulating it, but just let it flow freely…”, but maybe the yield isn’t that high…

Aquaignis Yoshikawa Minami: Crowds | Clientele | Recommended Days & Times to Visit

Everyone who visits Aquaignis Yoshikawa Minami says in unison, “That place is always empty.”
It seems that rumor is true, and on weekdays, no matter the time, it’s apparently completely deserted.

I (Nobuyo) visited around 4:00 PM on a Saturday, which is the absolute peak of peak times in the day-trip onsen world.
In a typical onsen facility, this is a devilish time slot where massive crowds and a “washing potatoes in a barrel” state are inevitable, but at Aquaignis Yoshikawa Minami, the crowd was just like, “Well, I guess this is it.”

While I did see a lot of families in the relaxation space after their baths, the bathing areas and restaurant were deserted.
Later, when it got dark around 6:00 PM, the number of people in the baths increased slightly, but it was still so empty that it made me worry, “Is this it for a Saturday evening/night…?” (Though, I was actually glad it was comfortable with fewer people).

Aquaignis Yoshikawa Minami also has a quite unique clientele. Because of its special location attached to a shopping mall, families with children are the most common, and solo guests are extremely rare. Elderly guests and groups of women are also sparse, so it wouldn’t be an exaggeration to say the clientele consists almost entirely of families.

Perhaps because there’s no direct access to the Tokyo area without transferring, there seems to be almost zero demand for “dropping by after work” even on weekdays. I think it’s a perfect place for people who hate crowds.

The fundamental reason for this unbelievably empty state is undoubtedly the lack of a sauna.
Young groups and middle-aged men whose main goal is the sauna probably just think, “Then let’s go to another facility that has a sauna.”

What was interesting was that despite the high number of families with kids, their manners weren’t bad, and they weren’t noisy.
Cheap day-trip onsens on a Saturday evening tend to turn into a hellish scene of agony and crying children running around, but the kids at Aquaignis Yoshikawa Minami were almost eerily quiet. I wonder if the educational standard in Yoshikawa is high…

I didn’t see any strict etiquette posters in the bathing area, but the customers’ manners were generally quite good. To be honest, it’s rare in Saitama to find a facility where the admission is cheap (under 1,000 yen even on weekends) yet attracts decent people.

Access to Aquaignis Yoshikawa Minami

The nearest station to Aquaignis Yoshikawa Minami is Yoshikawa Minami Station on the JR Musashino Line.
It’s a facility inside the Aeon Town directly connected to the station, but since it’s located at the very back in what feels like a separate building, it takes about 5 minutes on foot.

This station called Yoshikawa Minami is somewhat inconvenient, and you can’t access it directly from the Tokyo area or major cities in Saitama Prefecture.
In most cases, you need to transfer to the Musashino Line at some intermediate station.

If you’re driving, you can use the shared Aeon Town parking lot.
The first 2 hours are free, and if you use Aquaignis Yoshikawa Minami, you get an additional 2 hours free. In other words, it’s free for up to 4 hours (after that, a parking fee of 200 yen per 60 minutes is required).

To use the additional 2-hour free parking service, you need a parking ticket provided at the reception.
They’ll ask you, “Do you have a parking ticket?” when you leave, so don’t forget to get it.

Sneaking into Aquaignis Yoshikawa Minami!

Now that we mostly know what kind of place Aquaignis Yoshikawa Minami is, let’s go! To the hot spring…!
I’ll write frankly about my actual bathing impressions and things I thought “I wish this were more like…”

Reception ~ Hall

The first floor of a brand-new shopping center. Passing through the simple entrance noren curtain with weak assertiveness, a modern space unified in white spreads out before you.

The rows of shoe lockers are also pure white and lovely.
Even so, I feel like there’s an unusually large number of shoe lockers; do they ever actually get enough customers here to fill them all…

The shoe locker key serves as your in-facility payment wristband, so keep it on you and head to the manned reception counter.
It’s a post-payment system, so just getting your wristband registered completes your admission.

The first thing that bothered me here was the somewhat lifeless response from the staff.
Whether to call it unfriendly or distant, it had a very gloooomy vibe, and my first impression wasn’t great. No matter how refined the interior and stylish the atmosphere, if the staff’s attitude is iffy, it instantly kills the mood…

Next to the reception is a fairly well-stocked souvenir corner.
It features a selection typical of a spa facility, including Aquaignis original skin lotions. ▼

Right past the souvenir corner, a large space combining the relaxation area and restaurant spreads out, with the grand bath located even further back.
This area also has a stylish atmosphere based in white and dotted with wood-tone tables, bustling with families spending their post-bath time however they please.

Looking just at this part, it looks like a trendy glamping spa facility, which is lovely.
However, looking closer at the details, the cleaning was lacking in places, and stains stood out on the white walls, making the flaws noticeable.

To begin with, I don’t know if it’s because they use a lot of indirect lighting, if the lights are orangey, or if they’re aiming for a relaxing effect, but the whole place is just a bit too dim…
The light in the smoking room is even sensor-operated (the kind that turns on/off detecting people), and it turned off on its own while I was still inside. This is a “REEEEEEEE!!!!” incident. I’ll keep it a secret that I thought, “Eat shit, latest system, you stupid idiot.”

Super Simple Grand Bath

The grand bath at Aquaignis Yoshikawa Minami can be described in a single word: unbelievably simple.
While it has decent space, there are only five tubs in total, combining the indoor and outdoor areas.

Modest Openness and a Bleak Open-Air Bath Area

The open-air area spreading beyond the indoor bath is a space that can’t be called spacious, but isn’t cramped either.
In terms of area, I think it’s about the same as a typical day-trip onsen in an urban area.

However, my first impression upon stepping into the open-air area was, “Wow… it’s bleak…“

In this decently sized open-air area, there are only two things: a tub using hot spring water and a lying-down bath. Of these, the lying-down bath is kind of hidden in a recessed area, so practically speaking, there is only one tub in the open-air area.

There’s no TV or BGM in the open-air area, so it’s just purely quiet, which is a plus.
On the other hand, because there’s no sauna, there are no chairs for cooling down—just a few benches. There are many spaces that are simply “empty,” and the planted bushes are ridiculously low and serve no purpose… Overall, it gave me the impression that they are extremely bad at utilizing the space.

Even though it’s a facility in rural Saitama, it feels like an urban spa (in a bad way).
Some people might like this simple space, but personally, I couldn’t feel much openness and felt disappointed.

The open-air atmosphere was a “Hmm…”, but the crucial open-air hot spring was decent.
The temperature is perfect at around 40.5℃, and the brownish, transparent water has a quite strong salty taste. It’s a nice temperature, doesn’t feel bad on the skin, and it’s interesting water that contains a trace amount of carbon dioxide, so bubbles cling to your skin.

It doesn’t have that super slick or highly moisturizing feel, but it definitely makes your body feel warm and toasty. I didn’t smell much chlorine either, so I think it’s pretty good water.
However, perhaps because of the circulation system or poor drainage, the bath scum was extremely noticeable, which was quite a letdown.

▲ Located slightly away from the open-air hot spring is the lying-down bath.
The water temp is around 41℃, which is a bit hot for a lying-down bath. But it seems like it would be great in the winter.

The water used in the lying-down bath isn’t hot spring water but heated tap water, in the common style where you lie down in shallow water about 15cm deep.
Although it’s located in the open-air area, the surroundings and ceiling are part of the building, making it a semi-indoor space, so there’s absolutely no sense of openness.

Spacious Indoor Bath Area

The indoor bath area at Aquaignis Yoshikawa Minami has a high ceiling and is spacious, and the large windows on the open-air side are a nice touch.
However, the lighting is very dim, and combined with the lack of people, it has a rather lonely atmosphere.

It’s a shame that even though they have big windows, the rule seems to be to keep them closed.
Because of this, the indoor bath becomes a sealed space, trapping the steam and making it incredibly hot and humid.

A third of the indoor bath is a shower corner, and the rest consists of three tubs.
As mentioned earlier, there is no sauna, and no jet baths or carbonated springs either. To put it nicely, it’s very simple; to put it poorly, it lacks variety.

There are about 30 showers, operated by buttons. I was bothered by the suspiciously short time it takes for the water to stop and the abnormally weak water pressure, and the lack of partitions between the showers gives off an “Ah, they just don’t get it…” vibe.
The shampoo, conditioner, and body soap provided were nice ones containing tea extracts or something.

The largest and closest to the window in the indoor area is the 41℃ hot spring tub.
It’s the hottest water in the Aquaignis facility, but probably because it’s heated and diluted, the water color is lighter, and the chlorine smell feels a bit strong. This is probably the main tub, but I feel it’s a bit weak.

Right next to it, slightly elevated up a few steps, is the 39℃ lukewarm hot spring.
This is likely the raw source water, unheated and undiluted. It’s so murky and dark brown that you wonder if it’s even the same water as the other hot spring tubs, and you can feel on your skin that the components are quite concentrated.

The body-warming effect and the moist feeling clinging to the skin are clearly felt, and the high quality of the spring is undeniable.
There’s almost no chlorine smell, and since it’s lukewarm, I’m glad I could stay in it for a long time.

The water temperature and spring quality are so excellent that I personally thought, “They should just make THIS the main tub…”
The downsides are that the tub is small (capacity of about 6 people) and that it’s located at the top of some stairs, making it slippery and slightly dangerous.

And, there’s one more mysterious tub in the indoor bath called “Craft Onsen“.
The perfectly clear, tasteless, and odorless 38℃ water makes you think, “Uh… is this a hot spring? Isn’t it just hot water…?”, but this is a tub using the Craft Onsen produced by “Le Furo,” which I’ll introduce in the next section.

Craft Onsen is an artificial hot spring made by finely grinding ore from hot spring shale layers using natural hot spring water as a base, stirring it in a high-pressure pot, and extracting only the hot spring components at a high concentration.
Apparently, they can make concentrated hot springs several thousand to 10,000 times stronger than natural hot springs using patented technology, and it’s even said to be “effective in inactivating COVID” (yeah, right).

Hearing that makes it sound like some incredible water, but when you actually get in, honestly, it’s just hot water.
The fact that the Craft Onsen tub is spacious but unpopular, and mostly empty, is basically the answer. If you’re going to dedicate space to this, I don’t care what you do, just install a sauna!

There is no… Sauna. Instead, there’s “Le Furo”

Writing up to this point, I can’t help but feel, “Since you have the space, wouldn’t you get more customers if you installed a sauna?”, but the biggest reason Aquaignis Yoshikawa Minami didn’t install a sauna is probably the existence of Le Furo within the facility.

Le Furo is a “mineral mist bath” where you bathe in a misted version of the Craft Onsen mentioned in the indoor bath section.
You change into special facility wear, lie on medicinal stones, and bathe your whole body in high-concentration mineral mist at a room temperature of about 40℃ for 10 minutes → rest → bathe in the mist again… repeating this thermal bathing method. Apparently, it makes you sweat more than you’d imagine.

Well, simply put, it’s “bedrock bath + steam,” but hey, it’s the COVID-inactivating Craft Onsen, right! I’m sure it’ll make you super healthy! (monotone reading/deadpan).

The fee to use Le Furo is separate from the admission fee. It includes a towel, special wear, and mineral water, and costs around 4,000 yen for up to 2 hours (depending on the course), which is a fairly high price. Moreover, it basically requires a reservation, so I bet it’s hard to feel like just trying it out on a whim.

At Aquaignis Yoshikawa Minami, this Le Furo is positioned as a substitute for a sauna, which is why there’s no sauna in the bathing area.
Or rather, if they installed a sauna in the bathing area, Le Furo wouldn’t make any money, so they probably refuse to install one out of stubbornness. Ah, it’s a tough world…

Other Facilities (Relaxation Space | Dining Area, etc.)

A Stylish Relaxation Space Where You Can’t Lie Down

Taking up a large part of the Aquaignis Yoshikawa Minami grounds is the relaxation space located between the entrance and the restaurant.
It’s a very spacious area with a strong emphasis on design, featuring a cushion area and a stylish table area, so you can find your preferred spot and relax.

The fact that you can read manga and magazines (though the selection is limited) for free is a nice point.
However, the floor in the cushion area is hardwood, so a downside is that your body hurts if you lie down.

▲ Also, part of the lounging area features seats designed like horigotatsu with holes in the floor, but honestly, isn’t this dangerous?
There are holes about 30cm deep right along the walkway, so if you trip on one, you’re definitely going straight to the hospital. Plus, this facility is weirdly dim…

Since the main clientele at Aquaignis Yoshikawa Minami is families with children, and you never know when kids will start running around, this seems a bit too dangerous…
Rather than focusing on stylishness and design, I think they should create a space where customers can spend time safely and comfortably, like using softer, comfortable flooring materials and considering safety more.

Cheap and Delicious Restaurant

In contrast to the fairly bustling relaxation space, the restaurant connected right next to it was deserted.
There are seats past the ordering & serving counter, and those were about half full, but considering it was 7:00 PM on a Saturday, it was quite empty.

While I wouldn’t say the restaurant’s menu is extremely extensive, there are many unique items, making it fun to choose, which is great.
It’s also nice that the price range is relatively cheap for this kind of hot spring facility, so I give it a solid high rating here.

The menus are placed on each table, and once you decide, it’s a system where you go to the counter yourself and order verbally.
It’s completely self-service: when the buzzer they hand you rings, you go back to the counter to pick up your finished dish.

Thinking, “Since I’m here, I’ll order something you don’t often see at other hot spring facility restaurants…”, Nobuyo ordered the Iron Plate Neapolitan. I feel like you don’t see pasta dishes very often at hot spring restaurants. ▼

The Iron Plate Neapolitan looks rich and heavy just from a glance, and the taste is indeed rich.
It has the nostalgic feel of a retro coffee shop Neapolitan, and it’s quite delicious.

What bothered me was that despite being an Iron Plate Neapolitan, the iron plate wasn’t piping hot, and it didn’t even make a sizzling sound. Also, the response of the restaurant counter staff wasn’t very good (even though they couldn’t possibly be busy with this number of customers).

My biggest complaint was that when I asked for grated cheese to put on my Neapolitan, they told me, “We don’t have grated cheese, so please order the Iron Plate Cheese Neapolitan for an extra charge.”
Huh? The cheese on the Iron Plate Cheese Neapolitan is just regular melted cheese, right? Nobuyo wants GRATED cheese! Seriously, where in Japan is there a person who eats Neapolitan without grated cheese? What kind of place serves pasta but doesn’t have grated cheese? Seriously, management, use your heads (just remembering it makes me angry again).

Conclusion: Overall Rating & Recommended Sightseeing Plans Nearby

Aquaignis Yoshikawa Minami Overall Rating

Alright, now that I’ve spat out all my venom, let’s do the overall rating for Aquaignis Yoshikawa Minami.
This is a rating based completely on Nobuyo’s subjective opinion, but I’ll say it upfront. The rating is low.

An all-time low score in the 5s… Yep, too bad—serves you right, management who won’t provide grated cheese (still talking about it).

Well, if I were to write seriously, the biggest negative points are the lack of a sauna and the extremely low variety of tubs.
Also, while it’s good that it was designed with a solid concept of an “urban spa facility,” they focused too much on looks like stylishness and modernity, and it’s undeniable that the “software” side is quite weak, such as staff training, a comfortable environment for guests, and cleaning (I saw a staff member mopping the relaxation space, but if you’re going to do it that lazily and sloppily, you might as well just not clean and cut labor costs).

On the flip side, if I had to list the good points, they are the perfect access directly connected to the station, the fact that it’s quite empty after the evening even on weekends, and the appealing lukewarm bath with good spring quality.

It’s nice that the admission fee is set relatively low, but it’s true that the whole place reeks of stinginess—diluting a perfectly good hot spring, making the lights turn off automatically, etc.
Considering there’s no sauna and no jet baths, it might be more reasonable if the admission fee were a bit cheaper (I wouldn’t complain if it were like 650 yen on weekdays / 750 yen on weekends).

Therefore, Aquaignis is recommended for people who want to quietly soak in high-quality spring water in an environment far removed from crowds.
Conversely, it might be unsatisfying for those seeking a sauna, a variety of tubs, solid customer service, or high cleanliness.

Honestly, there are swarms of hot spring facilities in Saitama Prefecture in the same price range as Aquaignis Yoshikawa Minami where you can have an experience ten times higher in quality.
Rather than visiting specifically for this hot spring, it’s probably best used practically—just taking a quick bath on the way home from shopping at the attached Aeon Town.

If You’re Sightseeing Along with Aquaignis Yoshikawa Minami…

Yoshikawa City, Saitama Prefecture, where Aquaignis Yoshikawa Minami is located, is a slightly unusual town that promotes itself as the “Town of Catfish”.
At first glance, it looks like a typical residential area in the Tokyo suburbs, but it retains many charms unique to Yoshikawa, such as the downtown area that faintly preserves an Edo-era atmosphere and the surrounding nature-filled landscapes.

A “Town of Catfish” Dripping with Edo Atmosphere: Yoshikawa City

The area functioning as the central district of Yoshikawa City is around Yoshikawa Station, one stop away by train from Yoshikawa Minami Station.
With a history of prospering from river transport using the rivers flowing through the city, the townscape of Yoshikawa, opening up on the east bank of the Nakagawa River, has a lovely atmosphere that faintly retains traces of the Edo period.

While tourist attractions are limited, local gourmet foods like the famous catfish dishes and Kohamaya Yakisoba are also part of Yoshikawa’s charm.
Several large shopping centers are dotted around the suburbs, making it perfect for eating and sightseeing while you’re out shopping.