Dogo's origin stories reach deeper than the egret legend. An older myth involves two Shinto deities, Okuninushi no Mikoto and Sukunabikona no Mikoto, who traveled from Izumo Province. When Sukunabikona fell gravely ill, Okuninushi immersed him in Dogo's hot spring. The little god recovered so completely that he danced on a stone in the water to prove his restored vigor. His footprint, the legend says, remains on a stone called Tama no Ishi, still exhibited at the onsen. Whether or not gods bathed here, the geothermal waters are real -- naturally heated, mineral-rich, and flowing steadily for centuries without any sign of cooling.

The writer Natsume Soseki arrived in Matsuyama in the 1890s to teach at a rural school on Shikoku, and he was miserable. The only place he genuinely enjoyed was Dogo Onsen. His loosely autobiographical novel Botchan, published in 1906, immortalized the bathhouse -- in the story, the hot spring is the sole redeeming feature of an otherwise provincial backwater. The real bathhouse that Soseki frequented had been rebuilt in 1894 by Dogo Yunomachi mayor Isaniwa Yukiya, who commissioned a striking three-level public bath designed for maximum capacity. Soseki's room at the bathhouse is preserved and open to visitors, a literary pilgrimage site where fiction and architecture intertwine.

The bathhouse operates across multiple levels, each with its own character. The ground-floor Kami-no-Yu offers two baths for men and one for women -- the most democratic experience, where first-timers and regulars share the same mineral water. The second-floor Tama-no-Yu provides a more intimate setting with one bath each for men and women, and different pricing tiers that include tea service and rest areas. But the most remarkable space is the Yushinden, built in 1899 in the architectural style of the Momoyama period, reserved exclusively for the Imperial Family. The Gyokuza no Ma within it is for the emperor alone. This hierarchy of bathing -- commoner, noble, divine -- distills something essential about Japanese onsen culture, where the same water serves everyone but the ritual of bathing carries layers of social meaning.

Modern Matsuyama has engulfed Dogo in suburban sprawl, but the area around the bathhouse retains the atmosphere of a resort town. In the evenings, guests from ryokans and hotels wander the streets in yukata robes, wooden geta sandals clacking on the pavement as they stroll to and from the baths. The onsen is easily reached from central Matsuyama by tram, a rattling antique streetcar that adds to the sense of stepping backward in time. Despite the encroaching city, Dogo's identity remains anchored to the spring itself -- that same mineral water rising from deep beneath Shikoku, as warm as it was when the egret found it, as warm as it was when Soseki soaked away his frustrations, as warm as it was when gods danced on its stones.