Kanto Shibukawa, Gunma
Oyado Tamaki
お宿 玉樹
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Private bath onlyStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Private bath onlyStated by the facility
What the official page says
刺青(タトゥー)があっても入浴できますか? 大変申し訳ございませんが、お客様の職業に関わらず刺青・タトゥーをされたお客様の大浴場のご利用は一切お断りさせて頂いております。刺青・タトゥーがあるお客様は露天風呂付客室、又は貸切風呂(有料)をご利用下さいませ。
In short: Guests with tattoos can use a private bath.
Where it is
Kanto region, Gunma prefecture. About 119 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.