Oninosumika
Room Types
2
Water
Alkaline Spring
Private
In-Room Onsen
Cuisine
Kaiseki
About
Oninosumika (formally Shuzenji Hanare Yado Oni no Sumika) is a luxurious 9-room detached villa ryokan nestled along the Katsura River in the historic Shuzenji Onsen town on the Izu Peninsula. Each private villa is set within a beautifully curated Japanese garden and features its own open-air and indoor onsen baths filled with Shuzenji's renowned 1,200-year-old alkaline hot spring water. The Sukiya-style architecture delivers an intimate wabi-sabi aesthetic with world-class kaiseki cuisine.
Ideal For
Key Experiences
Gallery
Ready to experience Oninosumika?
See Prices on AgodaRoom Types
Premium Detached Villa
A larger private villa with expansive living space, premium furnishings, and generously sized open-air and indoor baths. Features enhanced garden views and upgraded amenities.
- Spacious private open-air onsen bath
- Private indoor onsen bath
- Expanded tatami living area
- Premium furnishings and decor
- Japanese garden terrace
- Air conditioning and heating
- Flat-screen TV
- Wi-Fi
- Mini refrigerator and tea set
Detached Villa with Open-Air Bath (Kurama-type)
A private Japanese-style villa set within the garden, featuring tatami floors, a sunken kotatsu or low table, plus both an open-air and indoor onsen bath with natural Shuzenji spring water. Each villa is uniquely designed.
- Private open-air onsen bath
- Private indoor onsen bath
- Tatami flooring
- Japanese garden views from bath and room
- Air conditioning and heating
- Flat-screen TV
- Wi-Fi
- Mini refrigerator
- Tea set
Onsen & Baths
Spring Type
Alkaline simple hot spring (pH 8.6, 63.2 mg/kg metasilicic acid)
Private Baths
- In-villa private open-air onsen bath
- In-villa private indoor onsen bath
Duration: Unlimited — each villa has its own private baths available 24 hours
Indoor Baths
- Private indoor bath in each villa
Outdoor Baths
- Private open-air bath in each villa
- Rinse your body before entering the bath
- Do not bring towels into the bath water
- Tie long hair up to keep it out of the water
- Stay hydrated between soaks in the mineral-rich water
- Your private baths are for your exclusive use — enjoy at your own pace
Dining
Private in-villa dining
Dedicated dining room
Specialty Dishes
Dietary Options
At least 3 days before arrival
Amenities
Premium
Best Times to Visit
Spring (Mar–May)
- Cherry blossoms along the Katsura River
- Fresh spring ingredients in kaiseki cuisine
- Pleasant temperatures for garden strolls
- Golden Week is very popular — book far in advance
- Some rainy days in late spring
Summer (Jun–Aug)
- Lush green garden at its most vibrant
- Cool river breezes along the Katsura
- Summer fireworks festivals in Izu
- Hot and humid — the onsen bath is best enjoyed in morning and evening
- Peak season pricing
Autumn (Sep–Nov)
- Spectacular autumn foliage in the garden and along the river
- Rich autumn kaiseki with mushrooms and seasonal fish
- Ideal onsen bathing weather
- Peak autumn foliage season (November) is extremely busy
- Book well ahead for autumn weekends
Winter (Dec–Feb)
- Quiet and serene atmosphere with fewest visitors
- Winter onsen bathing at its most blissful
- Winter seafood specialties including premium fish
- Evenings are cold — perfect reason to stay in your private onsen
- Some outdoor activities limited
Local Knowledge
Insider Tips
Hidden Gems
- Each of the 9 villas has a completely unique layout and design — no two stays are the same
- The alkaline spring water (pH 8.6) is renowned as a beauty spring that leaves skin exceptionally smooth
The garden between villas is designed so each cottage feels completely isolated despite their proximity
Tokko-no-yu in the Katsura River, the original spring Kobo Daishi created, is a short walk from the property
Must-Try Experiences
- Evening kaiseki dinner showcasing the ornate artistry and seasonal Izu seafood
- Private open-air bath soak in your villa surrounded by the Japanese garden
Morning walk to Shuzenji Temple and the Bamboo Forest Path before breakfast
Experience Tips
- Soak in your open-air bath at night for a magical garden atmosphere
- Walk to Shuzenji Temple early in the morning before the crowds arrive
Take the Bamboo Forest Path for beautiful photography opportunities
Ask the staff about seasonal activities and local recommendations
Cultural Notes
- Shuzenji Onsen is one of the Izu Peninsula's most historically important hot spring towns
- Kobo Daishi (Kukai) is one of Japan's most revered religious figures who also founded Shingon Buddhism
The concept of hanare yado (detached lodging) reflects the Japanese value of privacy and intimacy
Sukiya architecture originates from tea ceremony aesthetics emphasizing simplicity and natural materials
Ready to experience it yourself?
Check Availability & Book on AgodaPractical Information
Stay Details
Recommended Stay
1-2 nights to fully enjoy the private villa, onsen, kaiseki, and Shuzenji town exploration
Getting There
- Taxi from Shuzenji Station (5 minutes, approximately 1,680-2,400 yen)
- Tokaido Shinkansen to Mishima Station then Izu-Hakone Railway to Shuzenji (35 minutes)
- Total journey from Tokyo Station approximately 2 hours
- Free private parking available on-site
Before You Go
Dietary Options
At least 3 days before arrival
Booking Tips
- Book well in advance — only 9 villas means availability is limited
- Request a specific villa if you have a preference for layout or view
- Communicate dietary requirements at time of booking for the kaiseki dinner
- Consider weekday stays for better availability and a more serene atmosphere
Preparation Tips
- Pack light — yukata and amenities are provided
- Bring comfortable walking shoes for exploring Shuzenji Onsen town
- Download the Izu-Hakone Railway timetable for planning
- Arrive before dark to enjoy the garden views from your villa
Quick Facts
Nearest Station
Shuzenji Station (Izu-Hakone Railway Sunzu Line)
History
Shuzenji Onsen traces its origins to 807 AD when the Buddhist monk Kobo Daishi (Kukai) struck a rock in the Katsura River with his Buddhist implement (tokko), causing hot spring water to gush forth. He had witnessed a boy washing his sick father in cold river water and was moved by the boy's filial devotion. This legendary founding makes Shuzenji one of the oldest and most culturally significant hot spring towns on the Izu Peninsula, and Oni no Sumika honors this heritage through its traditional architecture and natural spring waters.
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