A hot spring inn that boasts silky, beauty-enhancing natural hot springs with a pH of 9.7 and a Japanese best starry sky overhead
Nagano Achi Village
"Hirugami Grand Hotel Tenshin" is a modern Japanese-style hot spring inn in Achimura, Shimoina District, Nagano Prefecture. Nestled in one of Minami Shinshu's foremost hot spring areas, it offers a luxurious soak in its alkaline simple sulfur spring, a "beauty bath" with an astonishing pH of 9.7 and a powerfully alkaline quality. On the 7th floor, there is an observatory public bath with sweeping views of the hot spring town and surrounding mountain ranges. On the 1st floor, a atmospheric garden open-air bath features a lie-down bath and jar baths, where at night you can gaze up at the magnificent star-filled sky of Achimura, recognized by the Ministry of the Environment as one of the "best places to see the stars shine most brilliantly," and fully enjoy the indulgent, silky hot spring water.
TypeNatural Hot Spring
A spacious, open, and luxurious observatory public bath occupying an entire floor on the top 7th floor. From the large glass windows, you can take in panoramic views of the gentle mountain ranges and tranquil hot spring town of Hirugami Onsen, enjoying a soak that feels almost as if you were floating in the sky. A dry sauna is also adjacent.
TypeNatural Hot Spring
A garden open-air bath on the 1st floor, marked by its impressive large cypress roof. A large outdoor rock bath, a lie-down bath where you can stretch out comfortably, and private-feeling jar baths are beautifully arranged within the garden. At night, you can leisurely enjoy the silky beauty bath while gazing up at one of Japan's most spectacular starry skies.
TypeNatural Hot Spring
The free foot bath, Hidamari no Yu, located within the hotel grounds. It is a very open and relaxing space, surrounded by abundant nature such as weeping cherry blossoms and a refreshing breeze. The silky, smooth beauty bath water gently soothes away the fatigue of travel from your feet upward.
Closed Days: None
395-0304 331-5 Chisato, Achimura, Shimoina District, Nagano Prefecture
Gender Access
Gender Separated
The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn moreA hot spring inn that boasts silky, beauty-enhancing natural hot springs with a pH of 9.7 and a Japanese best starry sky overhead
Nagano Achi Village
"Hirugami Grand Hotel Tenshin" is a modern Japanese-style hot spring inn in Achimura, Shimoina District, Nagano Prefecture. Nestled in one of Minami Shinshu's foremost hot spring areas, it offers a luxurious soak in its alkaline simple sulfur spring, a "beauty bath" with an astonishing pH of 9.7 and a powerfully alkaline quality. On the 7th floor, there is an observatory public bath with sweeping views of the hot spring town and surrounding mountain ranges. On the 1st floor, a atmospheric garden open-air bath features a lie-down bath and jar baths, where at night you can gaze up at the magnificent star-filled sky of Achimura, recognized by the Ministry of the Environment as one of the "best places to see the stars shine most brilliantly," and fully enjoy the indulgent, silky hot spring water.
TypeNatural Hot Spring
A spacious, open, and luxurious observatory public bath occupying an entire floor on the top 7th floor. From the large glass windows, you can take in panoramic views of the gentle mountain ranges and tranquil hot spring town of Hirugami Onsen, enjoying a soak that feels almost as if you were floating in the sky. A dry sauna is also adjacent.
TypeNatural Hot Spring
A garden open-air bath on the 1st floor, marked by its impressive large cypress roof. A large outdoor rock bath, a lie-down bath where you can stretch out comfortably, and private-feeling jar baths are beautifully arranged within the garden. At night, you can leisurely enjoy the silky beauty bath while gazing up at one of Japan's most spectacular starry skies.
TypeNatural Hot Spring
The free foot bath, Hidamari no Yu, located within the hotel grounds. It is a very open and relaxing space, surrounded by abundant nature such as weeping cherry blossoms and a refreshing breeze. The silky, smooth beauty bath water gently soothes away the fatigue of travel from your feet upward.
Closed Days: None
395-0304 331-5 Chisato, Achimura, Shimoina District, Nagano Prefecture
Gender Access
Gender Separated
The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more