Kanto Ryugasaki, Ibaraki
Tennen Onsen Yubune Ryugasaki
天然温泉 湯舞音 龍ケ崎店
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Super sento (large day-bath complex). Water source not checked; see the official page

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
刺青、タトゥーが入っていても入館できますか? 刺青、タトゥーのある方は原則入浴いただけません。ただし、当店販売のタトゥーカバーシール2枚以内で完全に隠れる場合に限り、入浴可能です。詳しくはお知らせページをご確認ください。
In short: Tattoos must be fully covered with cover stickers (up to 2 stickers), sold by the facility.
Where it is
Kanto region, Ibaraki prefecture. About 48 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.