Kanto Nakanojo, Gunma
Shima Onsen Sekizenkan
四万温泉 積善館
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Historic onsen ryokan with day bathing. Hot spring (spring details not checked)
Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
タトゥーあるけど利用できますか？ タトゥー（刺青）をシール等で完全に隠して頂ければ問題ございません。 難しい場合は、家族風呂（山荘の湯）か有料の貸切風呂をご利用下さい
In short: Tattoos must be completely hidden with stickers. Otherwise you can use the family bath or a paid private bath.
Where it is
Kanto region, Gunma prefecture. About 144 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.