SPA & SAUNA
Two Rare Natural Hot Springs, and a Sauna
Two rare natural hot springs, "Kin Onsen" and "Gin Onsen," await in every room.
Now, a brand-new private sauna has arrived in the Migiwa suite.
Two hot springs and a sauna — an elevated bathing experience, all your own.
Two Rare Natural Hot Springs, and a Sauna
Every Room Features Kin Onsen and Gin Onsen — Now With a New Sauna in Migiwa
Hoshi no Oto provides every room with two rare natural hot springs: "Kin Onsen" (Golden Hot Spring) and "Gin Onsen" (Silver Hot Spring).
Kin Onsen is an open-air bath where you can soak while gazing out at the sea just beyond. Gin Onsen, an indoor bath, sits right alongside it — so you can move freely between the two, one after another.
And in June 2026, the Migiwa suite welcomed a brand-new private sauna.
Crafted from a premium Estonian cabin, it promises an exceptional bathing experience unlike any other.
Open-Air BathKin Onsen — Golden Hot Spring
Rich in iron, Kin Onsen oxidizes to a warm reddish-brown the moment it meets the air. A faint mineral scent lingers as the water wraps you in a gentle, soothing touch with minimal irritation. Highly concentrated in salt with natural antibacterial properties, it delivers exceptional warmth-retention and moisturizing effects.
- Spring Water Quality
- Concentrated sodium chloride hot spring
- Effects
- Neuralgia, muscle pain, joint pain, stiff shoulders, motor paralysis, joint stiffness, bruises, sprains, chronic digestive diseases, hemorrhoids, poor circulation, recovery from illness, and fatigue recovery.
Indoor BathGin Onsen — Silver Hot Spring
Rich in metasilicic acid, Gin Onsen is often called the "hot spring for beautiful skin." Fine bubbles born of its carbonated waters gently envelop the skin, deepening its moisturizing effect. Let yourself be wrapped in this silky, colorless water for a truly indulgent moment.
- Spring Water Quality
- Weak alkaline, simple hot spring
- Effects
- Osteoarthritis, lower back pain, neuralgia, stiff shoulders, sprains, poor circulation, peripheral circulatory disorders, decreased gastrointestinal function, and more.
Outdoor SaunaSauna
PRIMO MINI is one of Estonia's finest sauna cabins, its double-glazed door and windows delivering a deep, comforting heat. Compact in footprint yet spacious enough for two, it's designed for togetherness — sit side by side as a couple to take in the sweeping view of Miyazu Bay through the window, or face each other for a more intimate moment.
In this private retreat, discover a sense of "totonou" — that perfect state of post-sauna bliss — unlike any sauna you've tried before.
*Available exclusively in the Migiwa suite
- Model
- PRIMO MINI (Made in Estonia)
- Features
- PRIMO MINI: Heat-treated wood and double-glazed tempered glass ensure optimal heat distribution and outstanding durability.
HUUM DROP 6: This electric sauna heater holds a generous load of stones (up to 55kg / roughly 120 lbs), producing a soft, deep steam. It pairs with the HUUM app via the UKU Wi-Fi control system for precise temperature control.
Guests may turn it on and off freely, though it will automatically switch off after 8 hours. - Capacity
- 2 guests
- Suite
- Migiwa -MIGIWA-
Sauna AmenitiesAll-Inclusive Service
We provide sauna attire such as ponchos and hats, along with hoji-cha (roasted green tea) for löyly, herbal teas and detox water to soothe your flushed skin before and after your sauna session, a revitalizing "oro-po"-style sauna drink, and ice cream — the perfect finish after a soak.
*Images are for illustrative purposes only. Contents may vary depending on availability.
Prohibited Actions during Bathing and Sauna Use
2. Entering the pool directly from the open-air bath, or entering the open-air bath or indoor areas directly from the pool.
3. Using the sauna while feeling unwell, or after consuming alcohol, is strictly prohibited.
