Shiriyaki Onsen Hoshigaoka Sanso

♨️A riverside hideaway fed by Shiriyaki hot spring water rising from the riverbed

Gunma · Shiriyaki Onsen Hoshigaoka Sanso

1

A Secluded Inn in the Kuni Mountains

• 🌲Deep in the mountains of the Kuni area in northwestern Gunma, overlooking the Nagasasawa River valley.
• ⭐The inn promises quiet: the murmur of the stream, birdsong and insects, and a sky full of stars.
• 📜The name Shiriyaki ('warming one's bottom') is said to come from people curing hemorrhoids by sitting on stones heated by the spring in the riverbed.

2

Free-Flowing Spring from the Riverbed

• ♨️The source is Shiriyaki Onsen welling up from the bed of the Nagasasawa River, used 100% natural and free-flowing (kakenagashi).
• 🧪55°C calcium-sodium sulfate-chloride spring, listed for hemorrhoids, rheumatism, skin conditions, high blood pressure and more.
• 🪨Men and women each have a streamside open-air bath and a stone-floored indoor bath under a high beamed ceiling; baths open after check-in and switch between men and women by time.

3

Cottages, Open-Air-Bath Rooms and Tatami Rooms

• 🏡The detached cottages Nodoca and Mocca each have an indoor bath with free-flowing spring water; two guests sleep in Simmons beds, three to four on futons.
• 🛁The annex rooms Nagasasa and Shirasuna have two rooms of 6 + 7.5 tatami mats and a streamside open-air bath (up to 4 adults).
• 🛏️The main building offers 6 to 12-mat Japanese rooms and twin-bed rooms on tatami; rooms are non-smoking (smoking allowed on annex and cottage decks).

4

Seasonal Food from Mountain and River

• 🥢Dinner runs 9 to 10 dishes; a sample menu includes maitake rice, Gunma trout carpaccio and a Joshu beef hot pot.
• 🌱Spring mountain vegetables, Kuni's local cucumbers and wide green beans in summer, mushrooms and runner beans in autumn, and pesticide-free vegetables from a hot-spring-heated greenhouse in winter.
• 🍽️Breakfast is also 9 to 10 vegetable-rich dishes; both meals are served at tables and chairs in the dining room.

5

Lounge and Guest Services

• ☕A small lounge displays a starry-sky painting by Tsurutaro Kataoka, with free coffee.
• 🍵A welcome drink is served at check-in, and the post-bath rest area has vending machines and cold barley tea.
• 🍕Hoshigaoka Terrace offers early check-in and late check-out plans with a seasonal pizza lunch; free Wi-Fi in all rooms.

6

River Bath and Kuni Excursions

• 🏞️A 3-minute walk away is Kawa-no-yu, a free natural open-air bath made by damming the river; it is mixed-gender, so bring a swimsuit.
• 🩴The front desk lends sandals and baskets for the river bath, which may be closed depending on season and weather.
• 🌸Nearby in Kuni: the Akaiwa silk-farming village, Lake Nozori with over 300 alpine plant species, and Chatsubomigoke Park, a national natural monument.

7

Access and Parking

• 🚃From Naganohara-Kusatsuguchi Station (about 2 hours from Ueno by limited express), take a bus 35 minutes to Hanashiki Onsen stop, then 800 m (about 10 minutes on foot).
• 🚐Pickup from Hanashiki Onsen bus stop is available with advance phone reservation.
• 🚗By car, about 90 minutes from Shibukawa-Ikaho IC on the Kan-Etsu Expressway; free parking for 20 cars.

3

Cottages, Open-Air-Bath Rooms and Tatami Rooms

• 🏡The detached cottages Nodoca and Mocca each have an indoor bath with free-flowing spring water; two guests sleep in Simmons beds, three to four on futons.
• 🛁The annex rooms Nagasasa and Shirasuna have two rooms of 6 + 7.5 tatami mats and a streamside open-air bath (up to 4 adults).
• 🛏️The main building offers 6 to 12-mat Japanese rooms and twin-bed rooms on tatami; rooms are non-smoking (smoking allowed on annex and cottage decks).

4

Seasonal Food from Mountain and River

• 🥢Dinner runs 9 to 10 dishes; a sample menu includes maitake rice, Gunma trout carpaccio and a Joshu beef hot pot.
• 🌱Spring mountain vegetables, Kuni's local cucumbers and wide green beans in summer, mushrooms and runner beans in autumn, and pesticide-free vegetables from a hot-spring-heated greenhouse in winter.
• 🍽️Breakfast is also 9 to 10 vegetable-rich dishes; both meals are served at tables and chairs in the dining room.

Show more (5 more)▾

A mountain inn combining free-flowing riverbed spring water, a walkable river bath and local seasonal cooking. Note that public transport is limited to a few buses a day, the private bath is currently unavailable, and there are almost no shops nearby.

#ShiriyakiOnsen#GunmaRyokan#KuniOnsen#KakenagashiOnsen#RoomWithOpenAirBath#HiddenOnsen#NearKusatsu

* This introduction was compiled from information published by each property (official website and similar sources), so some details may differ from what you find on the day. It is AI-assisted and can contain errors — please check the official website and the details shown at booking before you reserve.

Check In/Check Out Policy · Check In: 14:00 · Check Out: 11:00 · Last Check In:

* These policies are the property's own text, in English; the cancellation policy shown at booking takes precedence.

From onsen etiquette to check-in — the things worth knowing first.

What are the check-in and check-out times at Shiriyaki Onsen Hoshigaoka Sanso?

Check-in starts at 14:00 and check-out is by 11:00.

Where is Shiriyaki Onsen Hoshigaoka Sanso located?

It is in Agatsuma-gun. Address: 1539 Iriyama, Nakanojomachi.

What is the cancellation and refund policy?

Free-cancellation deadlines vary by rate plan and are shown with each room. Cancelling before the deadline gives a full refund.