Tohoku Tendo, Yamagata
Tendo Onsen Hohoemi no Yado Takinoyu
天童温泉 ほほえみの宿 滝の湯
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
タトゥーがある方の入浴可 貸切風呂
In short: The inn's official accessibility page lists 'bathing allowed for guests with tattoos'.
Where it is
Tohoku region, Yamagata prefecture. About 45 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.