



界 仙石原
Reviewed by Japan Ryokan Guide editorial team·Independent publication·How we verify
Checked against the official site · Sep 2026A 16-room Hoshino Resorts ryokan on the Sengokuhara plateau where every room has its own open-air bath fed from the Owakudani hot spring.
Answers taken from the inn’s or its operator’s official website, with the exact wording. We only show what the site states.
私たちは、お客様の文化背景や価値観を尊重し、刺青・タトゥーをされているお客様の利用を制限しておりません。Private bathing for tattooed guests: not clearly stated on the official site — ask the inn before booking.
ベジタリアンのお客様にもお召し上がりいただける料理をご用意しています。Vegan, Halal, Gluten-free: not clearly stated on the official site — ask the inn before booking.
Not clearly stated on the official site — ask the inn before booking.
温泉宿へひとり旅をしてみたいけれど最初の一歩が踏み出せない。そんな方に向け、温泉旅館「界」が”おひとりプロデューサー”まろ氏と共同開発したプランです。Check availability and prices on Trip.com and Agoda.
KAI Sengokuhara
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Multi-course kaiseki dinner and traditional Japanese breakfast are typically included in the nightly rate at this luxury ryokan. Premium kaiseki tiers, in-room dining (heya-shoku), and private dining rooms (koshitsu) may be available — request these preferences when booking through Trip.com or Booking.com.
Dietary requests (vegetarian, halal, gluten-free, allergies) should be communicated at booking, not on arrival — the kitchen pre-orders ingredients several days ahead.
13 questions about KAI Sengokuhara
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These Hakone ryokan offer a similar onsen-town experience at a meaningfully lower price — ranked by traveler review count.

ホテルグリーンプラザ箱根
A 123-room resort hotel above Ubako whose communal open-air bath faces Mt. Fuji head-on, and the cheapest Fuji-view onsen bed on the Sengokuhara plateau.
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吉池旅館
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from US$200 · per person · per nightfrom ≈ US$400 total for 2 guests

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吉池旅館
A grand ryokan with 6 private hot spring sources, a stunning Japanese garden with koi pond, and kaiseki dining.
from US$200 · per person · per nightfrom ≈ US$400 total for 2 guests
| Ryokan | From | Rating | Book |
|---|---|---|---|
| from US$253/person/night≈ US$506 for 2 | 9.6 293 reviews | Book on Trip.com | |
| from US$524/person/night≈ US$1,048 for 2 | 9.6 14 reviews | Book on Agoda | |
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| from US$402/person/night≈ US$804 for 2 | 9.3 749 reviews | Book on Trip.com | |
| from US$400/person/night≈ US$800 for 2 | 9.3 124 reviews | Book on Booking.com | |
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| from US$180/person/night≈ US$360 for 2 | 9.2 156 reviews | Book on Trip.com | |
| from US$440/person/night≈ US$880 for 2 | 9.2 41 reviews | Book on Booking.com | |
| from US$279/person/night≈ US$558 for 2 | 9.1 2,340 reviews | Book on Trip.com | |
| from US$70/person/night≈ US$140 for 2 | 9.1 187 reviews | Book on Booking.com | |
| from US$250/person/night≈ US$500 for 2 | 9.0 645 reviews | Book on Agoda | |
| from US$250/person/night≈ US$500 for 2 | 9.0 142 reviews | Book on Agoda |

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