Tohoku Iwaki, Fukushima
Ryokan Koito
旅館こいと
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
しかし、それ以外の一般のお客様は、タトゥーの有無にかかわらず受け入れます。
In short: The inn's official statement says it welcomes guests regardless of tattoos, while refusing organised-crime members.
Where it is
Tohoku region, Fukushima prefecture. About 139 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.