Overview
Imagine stepping away from the noise of everyday life and immersing yourself in the timeless rhythm of the coast. This is a place where the ocean meets you—the shoreline literally embraces the onsen, and waves sometimes lapping at the edge of your bath. Known as Furōfushi Onsen, its name means “unaging,” reflecting the belief that these reddish-brown, iron-rich waters can help you maintain strength and vitality.
Here, you won’t just bathe—you’ll experience three distinct hot spring environments:
The seaside open-air bath, perched at water’s edge, connects you directly to the sea. When tides are high, waves can wash in—and that’s part of the allure. You’ll soak in nature’s symphony of surf, wind, and sky.
“Furōfushi-no-Yu”, the panoramic grand bath in the newer wing, offers an elevated, spa-like moment. Floor-to-ceiling windows and a connected sauna and cold plunge create a complete rejuvenation sequence with sweeping ocean vistas.
“Golden-no-Yu”, in the original wing, offers a more intimate and classic indoor experience, balancing hot and warm tubs with convenient access to rinse off before stepping outside.
All baths share natural, continuous spring flow—drawn from 200 meters beneath the surface. The water starts clear and oxidizes to a distinctive copper tone as soon as it meets air, rich in sodium, calcium, and magnesium. These minerals bring warmth deep into the body, enhance natural healing, and soften your skin—earning it nicknames like the “hot-spring for heat,” “wound-healing spring,” and “skin-beautifying spring.”
Whether you choose to soak in wave-kissed water at sunrise or indulge in the panoramic view after dusk, you’ll feel the calming power of the coast in every sense
- Seaside open-air bath by the crashing waves
- New wing’s grand bath “Furōfushi-no-Yu”
- Main wing’s grand bath “Golden-no-Yu”
- Soak in the natural spring while gazing across the great sea.
Onsen and Wellness
Seaside Open-Air Bath
This legendary tide-level bath sits almost in the sea—so close that high waves can flood it, forcing temporary closure. Wake at sunrise or unwind by sunset in this unlit, primitive setting.
Opening hours for guests: sunrise to sunset
Day-use: 9 am–4 pm (last check-in 3:30 pm); during peak season, starts at 8 am
Notes:
- Conditions such as high waves, storms, or maintenance may close the bath (check daily).
- Photography is prohibited; the bath has mixed and female-only hours with rental swimwear (free for guests).
- No showers here—use indoor baths.
- Eyewards only in mixed zones, and tattoos are not permitted.
Grand Bath – New Wing: Furōfushi-no-Yu
This panoramic indoor-outdoor bath overlooks the Sea of Japan from a high vantage point. It includes both fresh natural spring and heated pure-water baths, plus sauna and cold plunge.
Elite feature: rotating gender schedule in early morning hours.
Opening hours for guests: 10:30 am–midnight, and 4:00–9:00 am (4–9 am rotates gender access)
Day-use: 10:30 am–2:00 pm (30 min before close); entry may be limited.
Tattoos are not allowed.
Main Wing Bath: Golden-no-Yu
This cozy indoor bath offers both hot and warm tubs and a place to rinse before using the seaside bath.
Day‑use hours: 9 am–7 pm (last entry 30 minutes prior); April–August extended 8 am–8 pm
Tattoos are prohibited here too.
Waters and Benefits
Spring type: Iron-rich sodium–chloride strong saline spring; clear at the source but turns reddish-brown upon contact with air.
Free-flowing, freshly drawn from 200 m underground (400 L/min); staff fully drains and cleans the baths daily.
Temperature at source: 52.2 °C
Minerals: Sodium, calcium, magnesium
Healer’s virtues:
- “Hot spring water” that retains heat deep into your body
- Antibacterial benefits that help heal wounds and skin conditions
- “Beauty spring” effects from metasilicic acid and bicarbonate ions that soften and moisturize skin
