Yakushido, built by Gyoki, has long been famous as one of Japan's three major onsen yakushi. Kusatsu in the east and Arima in the west are the two greatest hot springs in Agokuni, and when Yamanaka no Yu, Kinosaki no Yu, and Dogo no Yu are added to them, they are called the three great yakushi of hot springs in Japan.

Kusatsu Onsen had been working since 2018 to redevelop the area around Jizo no Yu, a public bathhouse located a couple of minutes' walk from Kusatsu's symbolic "Yubatake" (hot spring field). This area is known as "Ura-Kusatsu," and unlike the glamorous Yubatake, the area was a bit more relaxed, but the development was undertaken to create a town atmosphere that mixes the new with the old.

Shiranesan is a mountain of faith where God dwells. In the old days, there was a first-degree Shiranemyojin on Mt. Shiranesan and a second-degree Koshiranemyojin on Mt. Koshiranesan, and they were enshrined together in the Meiji era (1873).

It means the riverbank to the west of Kusatsu Onsen. In the past, it was also called "Oni no Sensui," or "devil's spring water," and hot spring water gushes out from all over the vast riverbed, which is the source of the Yugawa River.