Tohoku Tsuruoka, Yamagata
Komaginoyu
こまぎの湯
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Listed as tattoo-OKOfficial tourism listing
Community day-trip onsen. Natural hot spring (sodium-calcium sulphate spring, per the city)

Tattoo rule
Listed as tattoo-OKOfficial tourism listing
What the official page says
Tsuruoka is no exception. Here too, you'll find onsen that welcome guests with tattoos.
In short: Tsuruoka City's official tourism site lists Komaginoyu among onsen that welcome guests with tattoos.
Exact street address: see the official tourism page. Local bus C stops at Komaginoyu.
Where it is
Tohoku region, Yamagata prefecture. About 106 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.