I Looked Into Benten Kosen Hot Spring Inn

On this blog, I've been running a series looking into facilities that could work not just for camping, but also for those "let's skip camping and do a hotel spa day instead" kind of days.

This time I looked into "Benten Kosen" (Benten Mineral Spring), located in Minamiboso City, Chiba Prefecture. What caught my attention was seeing that it's limited to just 4 groups a day with only 4 rooms total, and I got curious about what kind of inn this actually is.

A Hideaway Inn Limited to 4 Groups a Day

Benten Kosen is apparently a hot spring inn located in Minamiboso City, Chiba Prefecture. It seems to have only 4 rooms total — 3 Japanese-style rooms and 1 Japanese-Western style room — with a system limiting stays to just 4 groups per day. Given how few rooms there are, I got the impression they're aiming to offer a quiet, peaceful stay.

The room types appear to be structured as follows.

• Kichi no Ma: A maisonette-style Japanese-Western room with its own open-air bath and balcony. It sounds like you can soak in a source-fed open-air bath in your room whenever you like
• Benten no Ma: A Japanese-style room on the first floor, apparently offering ocean views through the garden greenery
• Matsu no Ma: A Japanese-style room that seems to offer ocean views from a wide veranda
• Ebisu no Ma: Apparently an 8-tatami-mat Japanese-style room on the second floor

Check-in is from 3pm and check-out is by 10am, it seems. Early check-in and late check-out also appear to be available upon request. As for room rates, the official site doesn't seem to list a fixed price table — it looks like you need to check through an external booking system or OTA, so that would probably be the reliable way to check if you're actually considering a stay.

Komorin

Just knowing that only 4 groups can stay per day already feels special, doesn't it. I don't drive myself, so I'd need to look into transportation options, but it seems like you'd get to enjoy some really quiet time in exchange.

A Rare Hot Spring That Changes Color Within a Single Day

The hot spring at this inn apparently has a sulfur-calcium-magnesium-sulfate-bicarbonate quality, containing sulfur, hydrogen sulfide, and boric acid, among other things. What's distinctive is that the water color reportedly changes several times over the course of a day, shifting between milky white, whitish green, and jade, along with intermediate shades in between. Being able to see different appearances even if you bathe multiple times on the same day sounds like a pretty rare experience.

There's one indoor bath each for men and women, and rather than a circulating system, it's apparently a source-fed overflow style. The benefits listed seem to include neuralgia, muscle pain, joint pain, poor circulation, and chronic skin conditions.

On the other hand, regarding the open-air bath called "Hinata no Yu," even though it offers views of the ocean and Mt. Fuji, the official site apparently states clearly that "this open-air bath is not sourced from the spring." Since it seems to be a single bath used on a alternating schedule for men and women, it's probably best to keep in mind that the indoor bath is the main draw if you want to enjoy the actual hot spring experience.

Day-Trip Bathing and Meal Plans

For day-trip bathing, it's apparently 1,000 yen for the indoor bath only, or 1,500 yen for a combo of indoor and open-air baths (both prices per adult, for 1 hour). On top of that, there's reportedly a separate towel fee of 330 yen and a bathing tax of 50 yen. Business hours run from 6am to 10pm, but the indoor bath is apparently closed for cleaning between the morning and evening sessions for hygiene reasons. There also seems to be a plan combining day-trip bathing with lunch or dinner, starting at 11,000 yen per person, limited to 4 groups a day.

Dinner and breakfast are apparently served in your room or in a private dining room, which sounds like another appealing point since you can eat without worrying about others around you. The focus seems to be on local, wild-caught seafood such as spiny lobster, abalone, and splendid alfonsino, and since they're committed to using only wild-caught fish, the specific varieties apparently vary by day. Alongside local sake and locally produced wine, they also seem to offer an original sake as well as a tasting set featuring sake from breweries around Chiba. Free Wi-Fi is apparently available throughout the entire building, which felt like reassuring news for someone like me who leans more toward indoor activities.

The inn's name apparently comes from a nearby shrine dedicated to Benzaiten, located at Koura. The story goes that after Minamoto no Yoritomo was defeated in the Battle of Ishibashiyama, he landed in Awa Province and managed to stage a comeback, and it seems the inn ties this legend together with its hot spring quality and overall concept.

Rakuten Mobile Signal Conditions

When I checked the location of this facility (the Koura area of Minamiboso City) using the official My Area Network Simulation tool, the overall rating came back as "C."

Given this rating, it seems like a good idea to check in advance. The location being close to mountains and the coastline might be a contributing factor. Since free Wi-Fi is apparently available throughout the building, it seems wise to plan on using that as a backup.

Komorin

Since I use Rakuten Mobile myself, I'd definitely want to check that C rating ahead of time. That said, with free Wi-Fi in the building apparently available, factoring that in should make planning a lot easier.

Wrapping Up

Pulling it all together, my impression of Benten Kosen is that it's an inn where you can enjoy a rare source-fed hot spring that changes color throughout the day, all within a calm setting limited to just 4 groups per day. Each room seems to have its own view and layout, and since meals are apparently served in your room or a private dining room, it sounds like you could relax without worrying about anyone else around. That said, since the Rakuten Mobile signal came back as a C rating, if connectivity matters to you, it might be worth checking the official tool in advance for peace of mind.

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Related Links

• Official Site