Kanto Kusatsu, Gunma
Kusatsu Onsen Kirishimaya Ryokan
草津温泉 桐島屋旅館
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
おしゃれ目的で部分的にタトゥーを入れていらっしゃるお客様 当館では、おしゃれ目的で部分的にタトゥーを入れていらっしゃるお客様も共用の浴室をご利用頂けます。心配な方はお1人様からもご利用頂ける貸切風呂もございますのでお気軽にお問い合わせください。
In short: Guests with partial fashion tattoos can use the shared baths. Private baths are also available.
Where it is
Kanto region, Gunma prefecture. About 148 km in a straight line from Tokyo.
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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.