Tohoku Kitakami, Iwate
Geto Kogen Onsen (Tomori no Yu)
夏油高原温泉 兎森の湯
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Tattoos allowedStated by the facility
Resort onsen. Hot spring (spring details not checked)
Tattoo rule
Tattoos allowedStated by the facility
What the official page says
タトゥー・刺青を入れてますが温泉に入れますか？ 入れ墨（刺青）・タトゥーでの入浴制限はございません。
In short: The Geto Kogen resort FAQ says there is no bathing restriction for traditional or fashion tattoos.
Where it is
Tohoku region, Iwate prefecture. About 111 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.