Tohoku Ichinoseki, Iwate
Sukawa Kogen Onsen
須川高原温泉
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Mountain onsen inn with day bathing. Hot spring (spring details not checked)

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
なお、タトゥーを隠すシール等により、他のお客さまから入れ墨等が見えない状態の場合はご利用いただけます。
In short: Tattoos are refused in principle, but are allowed if covered with stickers so other guests cannot see them.
Where it is
Tohoku region, Iwate prefecture. About 80 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.