Escape into nature in just 90 minutes, with an in-room open-air bath and glamping for an extraordinary getaway.

Just a 90-minute drive from the city center, immerse yourself in the pristine nature surrounded by the national forest and streams of Oku-Boso. Enjoy luxurious moments in detached accommodations with private open-air baths or extraordinary glamping experiences. We offer both simple bell tents and premium tents equipped with showers and toilets, ensuring a comfortable stay without the need to bring anything. BBQ amidst nature is exceptional! Relive the excitement of childhood with a thrilling stay.

  • We visited last year and had an amazing, great-value summer with river play, BBQ, fireworks, and more—perfect for our family with young children—so we came back again this year. We made a mistake during the Reservation process, but the staff kindly helped us, and we were able to make more wonderful summer memories. With easy access from central Tokyo, it’s perfect for anyone who wants to enjoy glamping casually.

    Yahoo!トラベルユー... 7/27/2026
  • I stayed in a dome tent. It was equipped with amenities like air conditioning and a refrigerator, similar to a typical hotel, and had a very casual interior design. The meals included a variety of options such as meat and fish, which were highly satisfying. Although there was an issue with the BBQ grill not functioning properly, the staff responded promptly and courteously. I had a very fulfilling glamping experience.

    Yahoo!トラベルユー... 9/9/2025

Facilities and Services

See All
  • Room with Open-Air Bath
Open-air bath / Private bath
IN15:00~19:00
OUT10:00
Number of rooms15 rooms
Your childPermitted
PetNot allowed
We strictly do not allow pets. Please also refrain from keeping pets waiting in your car (including in the parking lot). Thank you for your understanding.

Notice from the Accommodation

- We do not accept cancellations by phone under any circumstances. If your online Reservation status remains “Reserved,” the prescribed Cancellation Fee will apply in all cases.

- If a futon is soiled due to bedwetting, a cleaning fee of JPY 3,000 per futon will be charged. If you lose the room key, JPY 5,000 will be charged. Smoking in the room will incur a cleaning fee of JPY 50,000.

- Guests who make a Reservation by the day before may be contacted. If we are unable to reach you, we may cancel the Reservation. For Reservations exceeding JPY 100,000, we may request an advance payment.
- We cannot accommodate pets. If you arrive with a pet on the day of check-in, your Reservation will be canceled and the prescribed Cancellation Fee will apply. If you bring a pet into the guest room without permission, we will charge JPY 30,000 as a Cancellation Fee and cleaning fee.
- Entry is not permitted before 14:00 as our staff are off duty until then. Entry before 15:00 is available only with a dedicated Plan. Changing your payment method on-site will incur an 8% handling fee.

[For guests with Reservations for Detached Rooms with Private Open-Air Baths]
You may choose breakfast from:
- “Hot sandwich on your room terrace”
- “Japanese breakfast at the dining area”
(Glamping guests cannot choose hot sandwiches.)
Please be sure to specify your choice in the remarks section (changes at a later date are not accepted).

[Limited-Time Sale] <Glamping> Save up to 30%—Available Now! (Standard BBQ)

IN 15:00~19:00
OUT 10:00
¥24,200
Dinner and Breakfast included ; 2 peopleTax included¥21,296
(USD 133.65)

[Glamping] Retreat in the Great Outdoors! (BBQ Course with Extra Meat)

IN 15:00~19:00
OUT 10:00
¥27,500
Dinner and Breakfast included ; 2 peopleTax included¥24,200
(USD 151.87)

[Main Building Japanese-Style Room - Standard] Enjoy the Great Outdoors! One Free Private Open-Air Bath Session (Standard BBQ)

IN 15:00~19:00
OUT 10:00
¥31,800
Dinner and Breakfast included ; 2 peopleTax included¥27,984
(USD 175.62)

[Limited-Time Sale] <Glamping> Save up to 30%—Available Now! (Standard BBQ)

IN 15:00~19:00
OUT 10:00
¥33,000
Dinner and Breakfast included ; 2 peopleTax included¥29,040
(USD 182.25)

[Glamping] Retreat in the Great Outdoors! (BBQ Course with Extra Meat)

IN 15:00~19:00
OUT 10:00
¥36,300
Dinner and Breakfast included ; 2 peopleTax included¥31,944
(USD 200.48)

Best-Selling Stays

Rooms With Open-Air Baths Popular At Stays

Ranking Of Accommodation With Delicious Dinner Buffet

Accommodation With Breakfast And Dinner Buffet

Accommodation For Child Sharing Existing Bedding

Popular Accommodation For Three-Generation Family Trips

Accommodation Convenient for Exploring Natural Attractions

Introduction of the Accommodation

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Glamping
Glamping
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Glamping
Image
Glamping

Glamping

Enjoy the great outdoors at a Property surrounded by the clear streams of Oku Boso.

Hanayamasui is located approximately 90 minutes from the city center. Surrounded by nature, you can hear the gentle sound of a flowing river and experience the changing seasons. Enjoy a relaxing time in this rich natural environment, listening to the sounds of rivers, waterfalls, wild birds, and deer while gazing at a sky full of stars.

Example of a guest room
Guest room

Enjoy convenient and comfortable outdoor "Glamping" along with "Detached one-unit rental Room" offering luxurious moments with a private open-air bath. Choose your preferred Room to suit your way of spending time.

Meal example
Meal

Enjoy a "Private Barbecue" on the exclusive terrace (guest room, glamping). Savor the abundant delicacies of Chiba's mountains and seas.

Facilities and Equipment of Accommodation

  • The room
    The room
  • Hot Springs & Baths
    Hot Springs & Baths
  • Facilities & Services
    Facilities & Services
  • Meal
    Meal

Basic Information

Card information
Credit card payments not accepted on site.
Pets
Not allowed
We strictly do not allow pets. Please also refrain from keeping pets waiting in your car (including in the parking lot). Thank you for your understanding.
Breakfast[For guests with a Reservation for a detached guest room with an open-air bath] You may choose your breakfast from: - “Hot sandwiches on your room terrace” - “Japanese breakfast at the dining area” Please be sure to specify your choice in the remarks section. *For glamping guests, breakfast will be hot sandwiches on your room terrace.*
Your child
You can stay.
[Important Notice] If a child wets the bed, a cleaning fee will be charged. Regardless of the extent, if we confirm it at the property, we will bill you accordingly. The same applies if you report it to us. If you are concerned, please bring your own waterproof sheet or other protective 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
Open-air bath
The number of Open-air bath
Business Hours
---
Hot spring
None
Free-flowing
None
Milky hot spring water
None
Additional Information
Remarks
Private bath
The number of Private bath
Business Hours
---
Hot spring
None
Free-flowing
None
Milky hot spring water
None
Additional Information
Remarks
Room with Open-Air Bath
Hot spring
None
Free-flowing
None
Milky hot spring water
None
Additional Information
Remarks
SaunaNone
Hot stone spaNone

Reviews

Overall Score
3.86
(11)
  • Rooms & Amenities
    3.64
  • Facility
    3.64
  • Hospitality & Service
    4.64
  • Meals
    4.45
  • Onsen & Bath
    3.27
  • Satisfaction
    3.55

*Reviews that have been translated from Japanese.*

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

Access Information

Address
Chiba Prefecture49 Kaisho, Otaki-machi, Isumi-gun
TEL:+81-80-8713-8787

Less than 90 minutes by car from central Tokyo.
Via the Aqua-Line: Exit at Kisarazu-Higashi IC, then about 40 minutes.
Via Ichihara IC: About 50 minutes via Ushiku.

Parking Information
Fee
Free for guests
Parking time
[Parking Hours] Parking is free from noon on your check-in date until check-out time.
Parking space
No restrictions
Number of parking spaces
20 cars available outdoor
Valet service
Unavailable
No reservation required. *If your group is arriving with two or more vehicles, please be sure to call us to confirm in advance.*

Pickup and drop-off information
UnavailableWe do not offer Shuttle Service.
The nearest stations are:
・JR Sotobo Line: Kazusa-Okitsu Station and Awa-Kominato Station.
Limited express trains stop at Kazusa-Okitsu Station only a few times, while all trains stop at Awa-Kominato Station. Please take a taxi from the station.

・Kominate Railway: Yoro Keikoku Station or Kazusa-Nakano Station are also accessible. Kazusa-Nakano Station is also served by the Isumi Railway. Please use a taxi or similar transportation from either station.

Frequently Asked Questions

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