The phrase "hidden sanctuary for adults," often used to describe upscale restaurants, applies equally well to certain sauna facilities. There are places that make you feel like a seasoned sauna connoisseur the moment you walk in — where the experience itself is extraordinary, and you find yourself savoring the very fact that you're there. That place is Asaka Sauna Nagomi, located in Asaka City, Saitama. Just a short walk from Asaka Station, the exterior already exudes that unmistakable hidden-retreat atmosphere. You pass through a Japanese-style entrance, complete your self check-in, pick up a face towel and bath towel from beside the reception desk, and head up to the men's bathing area on the third floor. After changing in the calm, understated locker room, you step into the main bathing area. A dark, modern space with dimmed lighting greets you — three sauna rooms, two cold plunge baths, a warm bathtub, and a row of around 30 reclining chairs spread out before you. No voices. Only the sound of flowing water, droplets hitting the floor, sauna doors opening and closing, and showers running. The rules of this facility strictly prohibit conversation. You face yourself, stay considerate of those around you, and focus entirely on restoring your body. That is the rule of Asaka Sauna. Asaka Sauna has three saunas: 1. Main Sauna A six-tiered sauna that fits around 40 people. Automatic löyly runs every 10 minutes, and the heat wave is scorching. The top bench reaches 105°C. 2. Self-Löyly Sauna A compact sauna for around 9 people at 90°C, where you can enjoy self-service löyly. 3. Low-Temperature High-Humidity Sauna A sauna room filled with the pleasant aroma of hinoki cypress. Set at 80°C and fitting around 9 people, staff periodically come in to apply hinoki aromatic water to the floor. For my first set, I enter the main sauna as a kind of greeting. With temperatures exceeding 100°C, it's intensely hot. I settle onto one of the middle benches and almost immediately begin to sweat. There's no TV, no conversation — only the sound of other bathers' breathing and the hiss of löyly. It's a perfect environment for meditation. I focus on my breath and slip into the zone, closing my eyes with the feeling of leaving the real world behind, and imagining that when I open them again, I'll return to it. Before long, the automatic löyly kicks in. When a heat wave surges through a sauna already over 100°C, it's hot enough to feel like you might actually get burned. That jolt of intensity snapped me right back to reality, and I headed straight for the cold plunge. The cold plunge bath was outstanding. Set at 15°C — widely considered the ideal temperature for post-sauna cooling — and large enough for around 20 people. I stretched out fully without worrying about anyone else, letting the heat drain from my body. Then I made my way to the relaxation area and sank into a reclining chair with my full body weight. The entire bathing space has that dark, modern aesthetic, so even while resting, it feels like you've slipped into another world entirely — the hidden-retreat atmosphere is thoroughly convincing. For my second set, I try the low-temperature high-humidity sauna. The moment I open the door, the wonderful scent of hinoki wraps around me. Apparently, staff regularly sprinkle hinoki-infused aromatic water on the sauna floor, which both spreads the fragrance and maintains the high humidity. At 80°C, the heat is gentle compared to the main sauna, making for a slow, immersive session. For anyone who finds extreme heat a bit much, this sauna would be perfect. The thoughtful range of temperatures and scents catering to different preferences is genuinely impressive. About an hour has passed since I entered the bathing area, and still not a single voice. There were around 20 other bathers, each seemingly absorbed in their own world. When I visit hot spring and sauna facilities, I always take a moment to observe the other guests — their behavior, their expressions. At Asaka Sauna, everyone seemed thoroughly engrossed in themselves. The dark, modern atmosphere soothes the mind, the sauna rooms have no TVs, the lighting is dim and conducive to meditation, and the relaxation area is lined with comfortable chairs — the whole place is designed so that speaking feels almost like a waste. You never want to leave. This is exactly what a hidden sanctuary for adults should be.

The phrase "hidden sanctuary for adults," often used to describe upscale restaurants, applies equally well to certain sauna facilities. There are places that make you feel like a seasoned sauna connoisseur the moment you walk in — where the experience itself is extraordinary, and you find yourself savoring the very fact that you're there. That place is Asaka Sauna Nagomi, located in Asaka City, Saitama. Just a short walk from Asaka Station, the exterior already exudes that unmistakable hidden-retreat atmosphere. You pass through a Japanese-style entrance, complete your self check-in, pick up a face towel and bath towel from beside the reception desk, and head up to the men's bathing area on the third floor. After changing in the calm, understated locker room, you step into the main bathing area. A dark, modern space with dimmed lighting greets you — three sauna rooms, two cold plunge baths, a warm bathtub, and a row of around 30 reclining chairs spread out before you. No voices. Only the sound of flowing water, droplets hitting the floor, sauna doors opening and closing, and showers running. The rules of this facility strictly prohibit conversation. You face yourself, stay considerate of those around you, and focus entirely on restoring your body. That is the rule of Asaka Sauna. Asaka Sauna has three saunas: 1. Main Sauna A six-tiered sauna that fits around 40 people. Automatic löyly runs every 10 minutes, and the heat wave is scorching. The top bench reaches 105°C. 2. Self-Löyly Sauna A compact sauna for around 9 people at 90°C, where you can enjoy self-service löyly. 3. Low-Temperature High-Humidity Sauna A sauna room filled with the pleasant aroma of hinoki cypress. Set at 80°C and fitting around 9 people, staff periodically come in to apply hinoki aromatic water to the floor. For my first set, I enter the main sauna as a kind of greeting. With temperatures exceeding 100°C, it's intensely hot. I settle onto one of the middle benches and almost immediately begin to sweat. There's no TV, no conversation — only the sound of other bathers' breathing and the hiss of löyly. It's a perfect environment for meditation. I focus on my breath and slip into the zone, closing my eyes with the feeling of leaving the real world behind, and imagining that when I open them again, I'll return to it. Before long, the automatic löyly kicks in. When a heat wave surges through a sauna already over 100°C, it's hot enough to feel like you might actually get burned. That jolt of intensity snapped me right back to reality, and I headed straight for the cold plunge. The cold plunge bath was outstanding. Set at 15°C — widely considered the ideal temperature for post-sauna cooling — and large enough for around 20 people. I stretched out fully without worrying about anyone else, letting the heat drain from my body. Then I made my way to the relaxation area and sank into a reclining chair with my full body weight. The entire bathing space has that dark, modern aesthetic, so even while resting, it feels like you've slipped into another world entirely — the hidden-retreat atmosphere is thoroughly convincing. For my second set, I try the low-temperature high-humidity sauna. The moment I open the door, the wonderful scent of hinoki wraps around me. Apparently, staff regularly sprinkle hinoki-infused aromatic water on the sauna floor, which both spreads the fragrance and maintains the high humidity. At 80°C, the heat is gentle compared to the main sauna, making for a slow, immersive session. For anyone who finds extreme heat a bit much, this sauna would be perfect. The thoughtful range of temperatures and scents catering to different preferences is genuinely impressive. About an hour has passed since I entered the bathing area, and still not a single voice. There were around 20 other bathers, each seemingly absorbed in their own world. When I visit hot spring and sauna facilities, I always take a moment to observe the other guests — their behavior, their expressions. At Asaka Sauna, everyone seemed thoroughly engrossed in themselves. The dark, modern atmosphere soothes the mind, the sauna rooms have no TVs, the lighting is dim and conducive to meditation, and the relaxation area is lined with comfortable chairs — the whole place is designed so that speaking feels almost like a waste. You never want to leave. This is exactly what a hidden sanctuary for adults should be.