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KAI Hoshino Resorts KAI Sengokuhara

KAI Hoshino Resorts KAI Sengokuhara

Opened on July 27, 2018, KAI Sengokuhara is a hot spring ryokan located near Hakone in a vast natural setting 700 meters up in the mountains. Both gallery and atelier, the ryokan is adorned with artwork by local artists, and it offers activities in which artists and staff inspire guests to explore their creativity.

  • 120 min. from Tokyo
  • English-speaking staff
  • Best Rate Guarantee
  • Free Wi-fi
  • Outdoor bath
  • Half-board

What is KAI?

What is KAI?

Japan’s hidden luxuries—at your fingertips

KAI is a leading brand of upscale boutique hot spring ryokans. Every establishment offers a contemporary take on the traditional Japanese inn, providing unique, location-specific experiences. From exclusive activities to specialty suites, KAI is an invitation to immerse yourself in the rich diversity of Japanese culture.


Private outdoor baths, located on the terraces of each room and fed by waters from the Owakudani volcanic valley, gaze out onto the vast expanses of Sengokuhara. Guests staying in the Signature Rooms also get to feast their eyes on room art created by local artists inspired by the nearby area.

KAI Signature Rooms

KAI Signature Rooms incorporate elements of regional craft cultures in their design. At KAI Sengokuhara, the rooms feature the artworks created by twelve artists who invited from around the world to serve as artists in residence.
During their stay, the artists immerse themselves in the location to create artworks that are then displayed in the ryokan's rooms. Each artist offers a different perspective of Sengokuhara that enhances the ryokan's sense of place.

Room types (4)

KAI Amenities

100% flax yukata

These casual kimono have been meticulously woven to provide cooling in the summer and heat in the winter.
*We will prepare it for those who wish. Please let us know when you check in.

Wrapping cloth

In Japan, objects are traditionally carried around in a makeshift bag formed from a sheet of cloth, known as furoshiki. Guests are invited to use these cloths to carry their belongings around the premises.

Luxury mattresses

Our own brand mattresses have been designed to provide proper support to the body while also being soft enough to sink into, allowing for undisturbed sleep.

Other amenities

Shower booth / TV / phone / electric kettle / fridge / safe box / hair dryer / toilet with bidet functions / air purifier with humidifying function


Guests are served Japanese cuisine that highlights the aromas and other qualities of the local seafood and vegetables, reflecting the ryokan's location in the mountains and proximity to the ocean. Dishes and dishware are combined in ways both beautiful and playful, as befitting an art-oriented ryokan.


Dinners consist of multi-course kaiseki meals that include visually pleasing dishes made with seasonal ingredients. Guests may choose between standard and special.


The centerpiece at breakfast is a thick slice of soft- grilled jinenjo yam, a local root vegetable known for its high nutritional content and tender texture.

  • No Western meals are served, either at dinner or breakfast.
  • Standard prices include half board.
  • Allergy Information

Hot spring

The bath halls are pumped with milky white waters, abundant in antibacterial qualities, from the Owakudani volcanic valley. Each hall has two indoor baths, one hot and one just above body temperature, as well as an outdoor bath with a view of the surrounding forests and a water garden of luminescent stones.

Yuagari Lounge

Located between the men's and women's bath halls, the Yuagari Lounge allows guests to cool off after a bath while sipping on a refreshing beverage inspired by the local culture.


Same day reservations available at the front desk.

KAI Cultural Discovery

Every KAI establishment offers a selection of free activities designed to introduce guests to Japan's regional cultures. KAI Sengokuhara organizes art activities that encourage guests to find inspiration in the artwork throughout the resort and in the stunning landscapes outside their windows.

Tenugui towel art

Guests are invited to join a nightly workshop where they will learn to decorate tenugui, a traditional Japanese handkerchief. Staff are on hand to assist guests with painting their original designs.



Check-in 15:00
Check-out 12:00
Rooms 16
Parking 16
Facilities Front Desk / Shared baths halls / Yuagari Lounge / Restaurant / Travel Library / Shop

Travel Library

Every KAI establishment features a library consisting of books on the area's history, culture, crafts, and geography. Complimentary refreshments are also served.

KAI Sengokuhara

817-359 Sengokuhara Hakone-machi, Ashigarashimogun,
Kanagawa 250-0631