A warm, handcrafted space carved from solid spruce aged 350–400 years, each plank shaped by artisans. Surrounded by the scent of wood, guests can control heat and steam to their liking with self-löyly. The temperature range is moderate so you can sit for extended periods and draw sweat gently. The soft warmth of the wood and gentle heat envelop the body, bringing deep relaxation. While gazing at the Ariake Sea panorama, you can quietly reconnect with yourself in a luxurious moment.

An original design that precisely assembles spruce into a 20 mm-diameter lattice. Thanks to the AINO low-strain sauna heater, introduced in Japan for the first time here, the sauna operates at a relatively lower temperature to reduce physical burden while still warming you deeply from the core. Guests can adjust heat and steam with self-löyly, and the lattice frames views of the Ariake Sea. This innovative space proposes a new, experiential way to enjoy the sauna.

A deep standing-style cold plunge bath on the terrace. Its structure allows you to soak up to your shoulders while facing the Ariake Sea, giving a very different impression from typical cold plunge baths. It uses the soft underground natural water of the Taradake range, so the chill is less sharp and invites longer enjoyment together with the view. After exiting, you move directly into the outdoor relaxation area to receive the sea breeze, spending a restful break as if surrendering your body to the sky and sea.

A deep indoor cold plunge bath on the 1F side. The standing-entry style is the same as the 2F bath, making it easy to soak up to the shoulders. The soft texture characteristic of Taradake underground natural water quickly calms the body while allowing you to enjoy the comfort of the water itself. The flow from the Grid Sauna is straightforward, making it easy to cool down gently after receiving heat comfortably.