Lamp no Yado Aoni Onsen

Lamp no Yado Aoni Onsen has been running since 1929 in the Aoni river valley outside Kuroishi, and it keeps one rule above everything: no electric lighting. After dark the main building and the annexes are lit only by oil lamps, there is no TV or air conditioning, and phones get no signal, so evenings are spent at the hearth or in the bath. The four baths use a clear, odorless simple spring that flows straight from the source, and three of them are built with hiba wood.

Kenroku-no-yu, the indoor bath, is open 24 hours and has a women-only outdoor section; the main-building bath and the waterfall-view Takimi-no-yu run 5:30 to 21:30 and are split by sex. The rock-built outdoor bath is mixed, with a women-only hour from 11:00 to 12:00. Overnight stays with two meals list at 13,900 yen per person, and day bathing rose to 1,000 yen in April 2026.

Getting here takes planning: from April to November, ride the bus from Kuroishi Station to Michi-no-Eki Nijinoko and transfer to the inn's shuttle, which must be reserved; in winter private cars are banned and the shuttle runs from Kuroishi Station. Downside: the outdoor bath cools in winter, and the inn asks guests to test the temperature before getting in.