Best Power

The final day in Nagasaki was rainy. Since it had been sunny for the past few days, today was a cool-down. In the afternoon, I went to a sauna deep in the mountains of the neighboring city of Isahaya. I had been here once before, two and a half years ago. Ever since then, I had always wanted to come back, and this rain made it happen.

This is not a new, trendy sauna that popped up during the recent boom. From what I can see, it exudes an atmosphere that suggests a history of thirty, or perhaps forty, years.
In the center of the dome-shaped room with earthen walls, a wood fire is burning. The room is dimly lit, relying only on the light from the flames. The floor is paved with what looks like bricks, and burlap fabric is spread over them. I can't see the ceiling clearly, but it seems quite low. The entrance is so low and small that you have to crouch to pass through. Once inside, you are urged to lie down immediately because the air higher up is smoky and suffocating. In the flickering light of the fire, I can see a previous guest lying down like a bagworm, covered in a burlap sack. Being careful not to step on them, I also cover myself completely with a burlap sack from head to toe and lie down.
The first time I came, everything was beyond my imagination, and I jumped out after about 10 seconds because I felt like I was going to have trouble breathing as soon as I entered the room. The lady in charge and an elderly woman waiting outside laughed at me. That’s how flustered I was. This time, I was able to stay calm and enjoy it, but it still had an incredible impact.
I doubt my writing skills can convey it. It's hard to describe. I don't know of any place like it.
To put it simply, it's like a bedrock bath style where you cover your head with a burlap sack, surround a large bonfire, and sweat while being lightly smoked... something like that...
Its name is "Oyu-Kamisashi Best Power Land." Anyway, it seems very effective. I wonder how you read "Oyu-Kamisashi"? But it conveys that it's something amazing, so that's fine, and the name "Best Power" also has a strong, intense feel that you don't often come across!

In the two and a half hours I was there, there were a total of seven male customers. There were 102 lockers.
I am now at the airport waiting for my flight home. When I bring the back of my hand to my nose, I can still faintly smell the soot.