Kansai Nara
Kamenoi Hotel Nara
亀の井ホテル 奈良
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
なお、タトゥーを隠すシール等により、他のお客さまから入れ墨等が見えない状態の場合はご利用いただけます。
In short: Tattoos must be fully covered with cover stickers.
Where it is
Kansai region, Nara prefecture. About 27 km in a straight line from Osaka.
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Rules can change. Check the official page on the day you go. Any paid link is labelled next to the button. We have not visited this bath ourselves.