Seiran-so

Name: Seiran-so
Address: 〒259-0314 Kanagawa Prefecture, 679 Miyakami, Yugawara-machi, Ashigarashimo-gun,, 679 Miyakami, Yugawara-machi, Ashigarashimo-gun, Kanagawa Prefecture, 259-0314, Japan
Telephone: +81-465-63-3111
Price range: 2 people for ¥25,480-
Rating: 4.01

Kanagawa Prefecture／Ashigara-shimo

Experience a secluded open-air bath beneath the waterfall and an indoor bath fed directly from the hot spring source, and savor the timeless charm of this long-established inn.

Surrounded by the lush nature of Oku-Yugawara, this long-established Accommodation is celebrating its 100th anniversary. Our pride and joy is the open-air “Senkyo” bath located directly beneath a waterfall, and guests staying in the New Building or Annex can enjoy breakfast and dinner served in their Room. Savor seasonal delicacies carefully selected by our head chef, including fresh local fish. Each Room also features a private indoor hot-spring bath fed directly from the source, and the spacious layout is ideal for families and group trips.

4.01(92)

A must for beer lovers!
We chose this place because it was all-inclusive, and both the baths and the service were excellent. In particular, as someone in the same industry, I was truly impressed by the attentiveness and consideration shown by the Nepalese staff in the dining area. Thanks to them, we had a wonderful time. Unlimited drinks from check-in to check-out was more than I could ask for as a beer lover—I enjoyed plenty. The open-air bath wasn’t too hot and felt great! We’d love to come back again! Thank you very much!
Yahoo!トラベルユー... 9/6/2026
Wonderful!
The staff were absolutely wonderful!This was our second visit with our 5-year-old child.The food was delicious!We’ll be back!
Yahoo!トラベルユー... 9/6/2026

Facilities and Services

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Hot spring

Open-air bath / Free-flowing hot spring / Large public bath / Private bath

IN	15:00～18:00
OUT	10:00
Number of rooms	42 rooms
Pet	Not allowed
Your child	Permitted

Photo

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Special sale due to open-air bath construction!

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Introduction of the Accommodation

Dinner buffet (example)

Japanese Gourmet Buffet

“Savor a little of everything and enjoy a wide variety of dishes”—that’s the Seiranso-style buffet. Enjoy dishes prepared with carefully selected seasonal delicacies and fresh local fish, chosen by our head chef.

Open-Air Bath

A soothing nature escape, refreshed by Shiraryu Falls and the Onsen.

Nestled into the lush natural landscape of Oku-Yugawara, our Accommodation offers a truly immersive retreat. The signature “Senkyo Open-Air Bath” sits beneath the 38-meter Shiraryu Waterfall. Surrounded by untouched greenery, you can relax in the hot spring while breathing in fresh, waterfall-cooled air—an indulgence unique to Seiranso. Next to it is the rustic “Bamboo Grove Bath.” Both baths are separated by gender, but the “Bamboo Grove Bath” may be reserved for private use depending on conditions and your Reservation. Enjoy an unforgettable moment with someone special.

A moment surrounded by nature’s beauty in every season

Our property features a garden and an inner courtyard. They offer a variety of views that change with the seasons. A special travel luxury is to forget the city bustle and simply listen to the sound of water.

Facilities and Equipment of Accommodation

The room
Hot Springs & Baths
Meal

Basic Information

Taxes	From April 1, 2026, an Accommodation Tax will be charged separately in accordance with the Yugawara Town ordinance in Kanagawa Prefecture. The Accommodation Tax is as follows per adult per night. Accommodation Fee under JPY 50,000: JPY 300 Accommodation Fee of JPY 50,000 or more: JPY 500
Card information	VISA / MASTER / JCB / AMEX / DINERS
Pets	Not allowed
Breakfast	There is no information about breakfast.
Your child	You can stay. - A kids’ room is available. - Guests with a Reservation under the Baby Plan can borrow a variety of baby items.
Room service	Not available
Common amenities	× Shampoo · conditioner × Body soap · soap × Towel · Bath towel × Body towel · sponge ○ Toothbrush set × Comb · Brush × Shower cap ○ Hair dryer × Shaving × Shaving Gel/Foam × Bath additives × Yukata × Nightwear × Bathrobe ○ Slippers × facial cleanser × Toner × Lotion × Makeup remover × Cotton swab × Cotton × Clothing deodorizing spray ○ Refrigerator × Minibar × Electric kettle ○ Tea set (free) ○ Television ○ Safe × Scale × Trouser press × Free morning edition × Pay-per-view broadcast × Satellite broadcasting × Video on Demand × Radio × CD player × DVD player × Blu-ray player × Speakers for portable audio × In-room PCs and tablets
Facilities and Features	○ Hot spring × Rooms with open-air baths available ○ Open-air bath ○ Free-flowing hot spring ○ Large public bath ○ Private bath × Sauna × Ganbanyoku (rock bathing) × Within a 5-minute walk from the station × Within a 5-minute walk to the convenience store. × Indoor pool × Outdoor pool × Pet-friendly × Spa facility × Fitness × Free shuttle service × Shuttle Service (Paid) × Room service × Room Service Available 24 Hours × Barrier-free × Childcare services
Esthetic Massage	None
Fitness gym	None
Public Bath	The number of Public Bath 2 Business Hours 05:30~24:00 Hot spring Available Free-flowing None Milky hot spring water None Additional Information 100% natural hot spring (Heating, Adding Water) Remarks * The Onsen uses a free-flowing source system and, when in circulation mode, is disinfected and adjusted with added water and heating. * As natural hot spring water is supplied to the baths, additional water may be added depending on the season. * The baths are unavailable from 10:00 to 15:00 due to cleaning.
Open-air bath	The number of Open-air bath 2 Business Hours 05:30~24:00 Hot spring Available Free-flowing None Milky hot spring water None Additional Information 100% natural hot spring (Heating, Adding Water) Remarks * The Onsen uses a free-flowing source system; when operating in circulation mode, disinfection and water adjustment/heating are performed. * As we draw natural hot spring water, additional water may be added depending on the season. * The facility is unavailable from 10:00 to 15:00 due to cleaning.
Private bath	The number of Private bath 1 Business Hours --- Hot spring Available Free-flowing None Milky hot spring water None Additional Information 100% natural hot spring (Heating, Adding Water) Remarks Additional fees may apply; please contact the Ryokan directly for details.
Room with Onsen Indoor Bath	Hot spring Available Free-flowing Available Milky hot spring water None Additional Information 100% natural hot spring (Heating, Adding Water) Remarks * The indoor bath uses free-flowing hot spring water, and during circulation we perform disinfection and add water and heat as needed. * As we draw natural Onsen water, additional water may be added depending on the season.
Spring quality and benefits	Chloride and sulfate spring Calcium–sodium sulfate spring Sodium–calcium chloride spring Injury Recovery, Fatigue Relief, Chronic Digestive Conditions ※Regarding the notation of "Gensen Kakenagashi" In some facilities, heating or adding water for temperature adjustment may be performed. Additionally, please note that in some parts of the facility, the hot spring water may not be free-flowing from the source. For more details, please contact each facility.
Sauna	None
Hot stone spa	None
Others	Others: UC, DC, NICOS, View
About Hygiene Measures	Our Accommodation has introduced a state-of-the-art ozone disinfection system. We will also thoroughly implement basic infection prevention measures. We kindly ask all guests to cooperate by disinfecting their hands, wearing a mask, and maintaining an appropriate distance from other guests.

Reviews

Overall Score

4.01

(92)

Rooms & Amenities
3.63
Facility
3.59
Hospitality & Service
4.28
Meals
4.03
Onsen & Bath
4.47
Satisfaction
4.07

*Reviews that have been translated from Japanese.*

*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*

Access Information

Address
Kanagawa Prefecture679 Miyakami, Yugawara-machi, Ashigarashimo-gun
TEL：+81-465-63-3111

20 minutes by bus bound for Oku-Yugawara or 8 minutes by car from JR Yugawara Station / About 60 minutes from Tomei Atsugi IC via the Odawara-Atsugi Road and Route 135

Parking Information
Fee Free for guests Parking time --- Parking space No restrictions Number of parking spaces 20 cars available outdoor Valet service Unavailable

Pickup and drop-off information
Unavailable

Frequently Asked Questions

Please provide information about Open-air bath.
・Business Hours: 05:30～24:00 ・Hot spring: Available ・Free-flowing: None ・Cloudy hot spring water: None ・Supplementary information: 100% natural hot spring (Heating, Adding Water) * The Onsen uses a free-flowing source system; when operating in circulation mode, disinfection and water adjustment/heating are performed. * As we draw natural hot spring water, additional water may be added depending on the season. * The facility is unavailable from 10:00 to 15:00 due to cleaning.
What are the qualities and benefits of the hot spring water?
The spring quality and efficacy of the hot spring are as follows. ・Spring quality: Chloride and sulfate spring Calcium–sodium sulfate spring Sodium–calcium chloride spring ・Spring efficacy: Injury Recovery, Fatigue Relief, Chronic Digestive Conditions
What kind of facilities and features are available?
There are the following facilities and features. Hot spring・Open-air bath・Free-flowing hot spring・Large public bath・Private bath
I would like to know the access information.
20 minutes by bus bound for Oku-Yugawara or 8 minutes by car from JR Yugawara Station / About 60 minutes from Tomei Atsugi IC via the Odawara-Atsugi Road and Route 135
Look at the map
Is parking available?
・Fee： Free for guests ・Parking space： Length --- Vehicle width --- Vehicle height --- ・Number of parking spaces： 20 cars ・Valet Service： Unavailable
Please provide information about Room with Onsen Indoor Bath.
・Hot spring: Available ・Free-flowing: Available ・Cloudy hot spring water: None ・Supplementary information: 100% natural hot spring (Heating, Adding Water) * The indoor bath uses free-flowing hot spring water, and during circulation we perform disinfection and add water and heat as needed. * As we draw natural Onsen water, additional water may be added depending on the season.
Please provide information about Private bath.
・Hot spring: Available ・Free-flowing: None ・Cloudy hot spring water: None ・Supplementary information: 100% natural hot spring (Heating, Adding Water) Additional fees may apply; please contact the Ryokan directly for details.
What kind of hygiene management is being conducted?
Our Accommodation has introduced a state-of-the-art ozone disinfection system. We will also thoroughly implement basic infection prevention measures. We kindly ask all guests to cooperate by disinfecting their hands, wearing a mask, and maintaining an appropriate distance from other guests.