Tohoku Fukushima
Takayu Onsen Kagetsu Highland Hotel
高湯温泉 花月ハイランドホテル
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Tattoos allowedStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Tattoos allowedStated by the facility
What the official page says
刺青(タトゥー)が入っているのですが、大浴場は利用できますか? はい、当館ではタトゥー・刺青のあるお客様も大浴場・露天風呂をご利用いただけます。
In short: The official FAQ says guests with tattoos can use the large bath and open-air bath.
Where it is
Tohoku region, Fukushima prefecture. About 74 km in a straight line from Sendai.
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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.