The main sauna is equipped with an IKI-brand stove imported from Finland. Water is periodically poured over the high stack of sauna stones, producing large volumes of steam and wave-like humidity that quickly fill the room. From 7:00 auto löyly activates every hour, and after 17:00 the interval shortens to every 30 minutes. A weekly rotating schedule also features staff-led löyly events. The staff-run event known as Jigoku löyly, where large amounts of löyly water and vigorous towel-fanning are used to rapidly raise the room temperature, is famous among heat masters and sauna enthusiasts as a Golden Time specialty.

A self-löyly-only sauna using a METOS-made ZIEL stove designed to withstand heavy löyly. Guests control scent and steam at their seat by pouring aroma water onto the stove; aroma bottles are available for purchase at reception. The quiet room plays healing music and offers an immersive experience where you craft your preferred heat and scent. Without a TV, it provides a focused, inward-facing contrast to the IKI sauna.

A Kampo herbal medicinal steam sauna that follows the tradition of medicinal herb baths established by Kobo Daishi Kukai in the Heian period. The room is maintained at 60–65% humidity and filled with the scent of Kampo herbs, allowing gentle, steady sweating at a relatively low temperature while inhaling herbal steam and components. A statue of Kukai carved from Aji stone, a Kagawa specialty, presides in the room, creating a distinct spiritual atmosphere.

A cold plunge bath fed by groundwater that boasts the lowest temperature in Kagawa Prefecture. The basin is 40–60 cm deep and in summer is filled with water around 8℃, producing an intense chilling sensation across the whole body. The extreme temperature gap with the 100℃ IKI sauna creates an unparalleled sense of totonou. After exiting the cold plunge, guests can recline in a chair in the outdoor King's open-air relaxation area and rest while enjoying the Takamatsu breeze.