Kanto Kusatsu, Gunma
Kusatsu Onsen Naraya
草津温泉 奈良屋
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Private bath onlyStated by the facility
Hot-spring bath. Hot spring (spring details not checked)
Tattoo rule
Private bath onlyStated by the facility
What the official page says
刺青があります。大浴場を利用できますか？ 刺青がある方の大浴場利用はお断りいたします。貸切風呂（有料）のご利用は可能です。
In short: Guests with tattoos can use a private bath.
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.