KAI Sengokuhara (界 仙石原) is a hot spring ryokan at 817-359 Sengokuhara, Hakone-machi, Ashigarashimo-gun, Kanagawa, with 16 rooms. Private outdoor baths are located on the terraces of each room, and the ryokan offers vast natural vistas and artwork designed to instil guests with creative passion. Milky-white volcanic hot spring waters feed both a hot bath and a pleasantly lukewarm bath.
Where KAI Sengokuhara is
KAI Sengokuhara sits at 817-359 Sengokuhara, Hakone-machi, Ashigarashimo-gun, Kanagawa. The property has 16 rooms, which places it among the smaller KAI houses — so the atmosphere stays quiet even when the house is full.
Getting there
By car, KAI Sengokuhara is at 817-359 Sengokuhara, Hakone-machi, Ashigarashimo-gun, Kanagawa 250-0631. From Gotemba Interchange, it is approximately 20 minutes via Japan National Route 135. From Tokyo, the route is via the Tomei Expressway to Gotemba Interchange, or from Tomei Expressway Atsugi Interchange to Hakone Shindo (Route 1) Yamazaki Interchange exit and then approximately 25 minutes by car via Japan National Route 138. From Nagoya/Osaka, take the Shin-Tomei Expressway to Gotemba Junction, change to the Tomei Expressway and continue to Gotemba Interchange. When using a car navigation system, enter map code 57 331 085*26. Snow and road freezing may occur in winter from November to March, and studless tyres or chains are recommended.
By train, the nearest station is Gora. The access text gives no further train directions.
What the ryokan is like
Staying at KAI Sengokuhara is a hot spring ryokan experience with private outdoor baths on the terraces of each room. The ryokan offers vast natural vistas and artwork designed to instil guests with creative passion. The onsen is fed by milky-white volcanic hot spring waters, with both a hot bath and a pleasantly lukewarm bath; at night, the water garden adjacent to the outdoor bath becomes a glow stone-illuminated work of art. There are 16 rooms for one to three guests, and the KAI Signature Rooms offer a deeper dive into local culture, with rooms adorned with works produced by artists who have actually stayed at the ryokan.
Kaiseki dinners consist of imaginatively presented dishes—such as a smoke dish meant to evoke Owakudani, a nearby volcanic valley—served on artistically designed dishware. The ryokan has one restaurant and two cafés or lounges.
Around Hakone-machi
Sengokuhara Onsen is in Hakone-machi, Ashigarashimo-gun, Kanagawa, approximately 15 minutes by car from Gora Station. The text connects the surrounding area with nearby Owakudani, a volcanic valley, and with milky-white volcanic hot spring waters. It gives no historical details about the onsen town itself, so its history cannot be described from the supplied facts; the paragraph is therefore limited to these location and regional references.
Frequently asked questions
What is the address of KAI Sengokuhara?
The address is 817-359 Sengokuhara, Hakone-machi, Ashigarashimo-gun, Kanagawa 250-0631.
How many rooms are there?
There are 16 rooms.
Which train station is the nearest?
The nearest station is Gora.
Planning a Kanto trip around it
KAI Sengokuhara works as one or two nights inside a longer Kanto route. We build private itineraries with a car and a private guide, and we book the ryokan as part of the plan rather than leaving you to assemble it. Tell us your dates and who is travelling and we will design it free of charge, with no obligation.
See our private tours in Kanto, or message us on WhatsApp.
Current rates for KAI Sengokuhara are worth checking against your dates before you commit — rates move with the season in onsen country.
BLISS TRAVEL plans private tours across Japan, China, Australia, New Zealand and Europe. Property details in this guide come from the official Hoshino Resorts pages for KAI Sengokuhara; facilities and access can change, so we confirm them with the ryokan before you book.
Planning a private tour?
Tell us your travel dates and we will shape an itinerary around them — hotels, cars and a private guide.
BLISS TRAVEL is part of ZEUS GROUP