Kansai Kobe, Hyogo
Arima Grand Hotel
有馬グランドホテル
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
※小さなワンポイント程度のタトゥーにつきましてはカバーシール1枚（10㎝×10㎝）で隠していただければ入浴いただけます。
In short: Small one-point tattoos are allowed if covered with one 10 × 10 cm cover sticker.
Where it is
Kansai region, Hyogo prefecture. About 25 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.