The neighborhood sentō that opens at dawn, before the city needs it

Before the trains fill and the conbini lights lose their authority to daylight, a handful of neighborhood bathhouses unlock their wooden doors. The Japanese call them sentō, and the early ones — open by six, sometimes before — belong to the people who keep the city running while it sleeps.

The door, the locker, the coins

You leave your shoes in a wooden cabinet and turn a paddle-shaped key. Past the curtain — the noren, split down the middle — a raised counter sits between the men's and women's halves. This is the bandai, and the person behind it has read every regular's posture for thirty years. A bath costs the ward-fixed rate, a little over five hundred yen, printed on a laminated card nobody needs to check.

What the steam asks of you

Wash first, fully, at a low stool with a hand shower, then enter the water already clean. The tubs run hotter than most visitors expect, and the older men will not dilute it for your comfort. A smaller cold tub waits beside the hot one; moving between them is the whole technology, refined over centuries. Nobody photographs this. Phones stay in the locker, and the etiquette of not-looking is its own quiet courtesy.

The mural nobody signs

On the tiled wall above the water, more often than not, there is Mount Fuji — painted in flat blues by one of the last working bath-mural artists, a trade now down to a few hands nationwide. The paint is renewed every few years, the date tucked into a corner if at all. It is the only landscape in Tokyo you can sit inside while you look at it.

朝風呂は、街がまだ自分のものだと思える最後の時間かもしれない。

Come on a weekday, before eight. Bring a small towel and soap; some houses sell them, some lend them. Leave when your skin has gone the colour of the tiles, step back into shoes that are still cold, and walk out into a morning the working city has only just begun to claim.