Kanto Nikko, Tochigi
Oku-Nikko Hotel Shikisai
奥日光ホテル四季彩
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
タトゥー・入れ墨があるお客様は、 施設指定のカバーシール2枚で覆うことができる サイズに限りご入浴いただけます。
In short: Tattoos must be small enough to cover with two of the hotel's cover stickers.
Where it is
Kanto region, Tochigi prefecture. About 122 km in a straight line from Tokyo.
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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.