Enjoy a blissful getaway at an Onsen spa resort featuring “Kuroyu” black mineral water.

The resort villa facility "五氣里-itsukiri-", conceptualized as a village embodying the five key elements "Village, Food, Property, Onsen, Play" and a gathering place for many to nurture their spirit, opened in July 2023 in Isumi City, Chiba Prefecture. Guests will stay in high-class private spaces close to abundant nature. Enjoy exceptional moments with natural onsen baths equipped in all buildings, a first in Isumi City.

  • Perhaps because we stayed on a weekday when there were fewer guests, we were able to enjoy a calm and relaxing time. It was quiet and surrounded by the sounds of nature, and even our senior dog could play to their heart’s content. The meals also reflect a dedicated commitment to gastrotourism, showcasing great care and impressive skill. With only the essential services provided, we appreciated the kindness of being given space to relax freely.

    Lkjh 8/2/2026
  • We stayed in the Dog Suite (open-air Onsen bath, private pool, and sauna) as a couple with one small dog. The black Onsen water, in-room facilities, and meals are among the best we’ve experienced at dog-friendly hotels in the same price range. We liked it so much that we made our next Reservation during our stay. Many of the staff seemed to be in training or still getting used to things, but their sincerity came through, and there was nothing unpleasant at all. At breakfast, the service from the male staff member was understated yet refined, and we were very satisfied with the quality of souvenirs he recommended, such as chili oil. We’re also very excited that an affiliated Hotel is set to open on Onjuku’s beachfront. Together with this property, it looks like it will become our go-to Accommodation going forward.

    猿猫犬 7/7/2026

Facilities and Services

See All
  • Hot spring
  • Room with Open-Air Bath
  • Pet-friendly
  • Spa facility
Open-air bath / Large public bath / Sauna / Outdoor pool / Free shuttle service / Room service
IN15:00~18:00
OUT10:00
Number of rooms20 rooms
PetPermitted
Your childPermitted
Aug 2023Renovated
  • Fourth
  • 38㎡
  • Capacity 1~5 people

【No Meals Included】<simple stay> Enjoy a free stay with no meals included; bring your own Plan.

IN 15:00~18:00
OUT 10:00
¥41,600
No meals ; 2 peopleTax included¥31,200
(USD 195.56)

【1 night 2 meals】<Outdoor style>BBQ Plan

IN 15:00~18:00
OUT 10:00
¥65,800
Dinner and Breakfast included ; 2 peopleTax included¥49,350
(USD 309.32)
Aug 10, 2023Renovated
  • Single
  • 78㎡
  • Capacity 2~9 people

【No Meals Included】<simple stay> Enjoy a free stay with no meals included; bring your own Plan.

IN 15:00~18:00
OUT 10:00
¥43,800
No meals ; 2 peopleTax included¥32,850
(USD 205.90)

【1 night 2 meals】<Outdoor style>BBQ Plan

IN 15:00~18:00
OUT 10:00
¥68,000
Dinner and Breakfast included ; 2 peopleTax included¥51,000
(USD 319.66)
Jul 2023Renovated
  • Japanese-Western room
  • 70㎡
  • Capacity 1~5 people

【No Meals Included】<simple stay> Enjoy a free stay with no meals included; bring your own Plan.

IN 15:00~18:00
OUT 10:00
¥46,000
No meals ; 2 peopleTax included¥34,500
(USD 216.24)

【1 night 2 meals】<Outdoor style>BBQ Plan

IN 15:00~18:00
OUT 10:00
¥70,200
Dinner and Breakfast included ; 2 peopleTax included¥52,650
(USD 330.01)

Best-Selling Stays

Accommodation For Child Sharing Existing Bedding

Recommended Accommodation For High School Student Trips

Family-Friendly Onsen Accommodation For Guests With Children

Introduction of the Accommodation

Exterior
Exterior
Exterior
Exterior
Exterior
Exterior
Exterior
Exterior
Exterior
A rare black water Onsen room in The whole country, Chiba, Isumi's Onsen spa resort Gokisato - itsukiri - opening on July 29, 2023

90 minutes by car from the city center. Located in Isumi City, Chiba Prefecture, a place blessed with a warm climate throughout the year, beautiful seas, and tranquil satoyama landscapes. A new resort Facility featuring private Onsen with kuro-yu in every room has opened in this captivating destination that attracts numerous visitors. The kuro-yu, a nationally rare hot spring, is drawn from 300 meters underground. Experience the luxurious SPA that offers "Sodium Bicarbonate Spring," which clings to your skin, and leads you to profound relaxation, soothing both body and mind. Your stay will be in a high-class private space where you can feel the richness of nature up close. Enjoy the "Bijin no Yu" (beauty-enhancing black hot spring) and savor the seasonal gourmet delights of Chiba and Isumi in an auberge-style dining experience. Surrounded by lush green mountains, indulge in a luxurious moment at the Onsen spa resort "Gokiri-itsukiri."

~8 Attractions~

Onsen
01 Indulge in the natural Onsen with the rich black water of Boso.

Chiba Prefecture, one of the Kanto region's best-kept secrets for Onsen destinations. At "五氣里-itsukiri-", you can enjoy natural black Onsen in private baths exclusive to each villa. Indulge in the therapeutic benefits of the natural Onsen as many times as you like, at your preferred timing, and savor moments of relaxation to your heart's content. Additionally, we offer a large communal bath area featuring two types of natural Onsen. With spacious separate areas for men and women, the facilities include indoor baths, open-air baths, saunas, and cold baths, providing a comprehensive lineup. Our Property is designed to ensure a satisfying stay as an Onsen retreat.

Natural Onsen & Private Pool & Sauna
02 1 Exclusive Premium Suite Rental with 2 types of natural Onsen, private pool, and sauna.

"五氣里-itsukiri-" features 13 suite villas and 7 glamping tents. Among the diverse room types, the Premium Suite series, positioned as the pinnacle, includes two exclusive villas. These private two-story villas, fully renovated from traditional houses, offer two in-room Onsen baths, a pool, a sauna, and unparalleled exclusive facilities. Accommodating up to 13 guests, they represent the most spacious and well-equipped high-end option in the region.

Private Villa
03 All rooms feature black water Onsen, 6 types of private villas.

Suite Villa features spacious accommodations over 80m², complete with natural Onsen baths. This high-grade design promises a quality stay close to the rich nature of the countryside. We offer six unique room types, including lofts, saunas, and options with dog-friendly play areas and pools.

Glamping Dome
04 Glamping Dome featuring rare black water Onsen in guest rooms

For a more nature-immersive outdoor stay, we recommend staying in a glamping tent. The large dome tents, available in 7M and 10M diameter types, are exclusively rented and offer spacious areas ideal for group use. They feature all-weather dining spaces and fully equipped restrooms, ensuring comfort for women and children alike.

Large Public Bath & Sauna
Large public bath and sauna suitable for large groups.

The main building features indoor and outdoor baths with black water, a sauna, and a cold bath. Designed to satisfy Onsen and sauna enthusiasts, it is suitable for groups or families.

Facility Image
Enjoy a private space with your beloved pet. Experience the Onsen in your room together.

Your beloved dog, a cherished member of your family. We offer four types of Rooms where you can relax and enjoy time with your dog. All Rooms are independent, allowing you to stay without worrying about other dogs. Additionally, the Rooms are equipped with private Onsen facilities, enabling you to enjoy the natural black hot spring water without being separated from your beloved dog.

Meal example
07 A blissful feast enjoying Boso's gourmet delights An auberge style that captivates food enthusiasts

The highlight of your stay at "五氣里-itsukiri-" is undoubtedly the exquisite seasonal cuisine offered at the on-site restaurant. Utilizing seasonal ingredients from Boso and Isumi, dishes are prepared using optimal methods and techniques. Aged meats, game, and various seasonal ingredients are cooked over wood or charcoal to enhance their natural flavors. These dishes, available only here, provide a blissful moment immersed in gourmet dining.

Meal example
08 Enjoy a BBQ style savoring seasonal delicacies grilled to perfection.

For your outdoor-oriented stay needs, we recommend enjoying BBQ in your Room. The BBQ menu delivered from the restaurant is a special selection featuring local ingredients from Chiba. Simply grill or heat it up to enjoy effortlessly. Additionally, we offer a "Room-only Plan" where you can bring your own ingredients and enjoy a personalized BBQ experience.

Facilities and Equipment of Accommodation

  • The room
    The room
  • Restaurant
    Restaurant
  • Facilities & Services
    Facilities & Services

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS / UnionPay
Pets
Permitted
Please bring proof of your dog’s rabies vaccination. We provide a crate, pee pads, and other essentials needed for your dog’s stay indoors. (Supplies are provided for one dog only; please bring additional items if you have more than one.) *Please bring your dog’s food.*
BreakfastThere is no information about breakfast.
Your child
You can stay.
Room service
Available for use
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
Outdoor pool
Available period
7/13/2024~9/23/2024
Business Hours
08:00~17:00
Final admission time
16:00
Fee(Guest)
Free
Fee(Non-guest)
---
Children's pool
Available
Age restriction
Pool shape
Rectangular
Pool size
Length 15m
Width 4m
Water depth 120cm120cm
Esthetic Massage
Available
■Gokiri Special Treatment ・120 minutes: JPY 28,000 (tax included) ■Aroma Body Treatment ・60 minutes: JPY 15,000 (tax included) For reservations, please contact the Facility directly.
Fitness gym
None
Public Bath
The number of Public Bath
2
Business Hours
15:00~10:00
Hot spring
Available
Free-flowing
None
Milky hot spring water
None
Additional Information
(Heating, Adding Water)
Remarks
Please enter by 9:30 PM. (Closed from 10:00 PM to 7:00 AM for maintenance.)
Open-air bath
The number of Open-air bath
2
Business Hours
15:00~10:00
Hot spring
Available
Free-flowing
None
Milky hot spring water
None
Additional Information
(Heating, Adding Water)
Remarks
Please enter by 9:30 PM. (Closed from 10:00 PM to 7:00 AM for maintenance.)
Room with Open-Air Bath
Hot spring
Available
Free-flowing
None
Milky hot spring water
None
Additional Information
(Heating, Adding Water)
Remarks
Room with Onsen Indoor Bath
Hot spring
Available
Free-flowing
None
Milky hot spring water
None
Additional Information
(Heating, Adding Water)
Remarks
Spring quality and benefits

Sodium Bicarbonate Spring

Chronic muscle or joint pain or stiffness; muscle stiffness associated with paralysis; reduced gastrointestinal function; mild hypercholesterolemia; mild asthma or emphysema; hemorrhoid pain; autonomic nervous system imbalance; various stress-related symptoms; recovery period after illness; fatigue recovery; health promotion

SaunaAvailable
Hot stone spaNone

Reviews

Overall Score
4.52
Wonderful (99)
  • Rooms & Amenities
    4.38
  • Facility
    4.55
  • Hospitality & Service
    4.61
  • Meals
    4.42
  • Onsen & Bath
    4.62
  • Satisfaction
    4.57

*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 Prefecture2891 Shimofuse, Isumi City
TEL:+81-470-60-6090

[For Guests Arriving by Car]
Approx. 90 minutes from the Tokyo area
Via the Tokyo Bay Aqua-Line
Approx. 30 minutes from Ichihara-Tsurumai IC on the Ken-O Expressway

[For Guests Arriving by Train]
Approx. 12 minutes by car from JR Ohara Station (Shuttle Service available; Reservation required. Please make a Reservation by the day before.)

Parking Information
Fee
Free for guests
Parking time
---
Parking space
No restrictions
Number of parking spaces
23 cars available outdoor
Valet service
Unavailable
Large buses are not permitted.

Pickup and drop-off information
Available (Free)We offer a free Shuttle Service from JR Ohara Station by Reservation only, on a first-come, first-served basis (up to 8 guests).
[Arrival] 14:00–18:00 *Please make a Reservation by the day before. (Same-day requests cannot be accepted.)
[Departure] (1) 9:00 (2) 10:30 *Please make a Reservation by the day before. (Same-day requests cannot be accepted.)

[Notes]
- Reservations are accepted on a first-come, first-served basis.
- Please make a Reservation by the day before. (Same-day requests cannot be accepted.)
- Please complete check-out before your departure time.

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