Hokkaido Wakkanai, Hokkaido
Hotel Meguma
ホテルめぐま
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(刺青)があっても入浴できますか? シール等で隠れる程度のサイズであればご入浴いただけます。また、民族的な歴史・文化に由来するタトゥーをお持ちのお客様もご入浴可能です。
In short: Tattoos small enough to hide with stickers are allowed. Guests with tattoos of ethnic or cultural origin can also bathe.
Where it is
Hokkaido region, Hokkaido prefecture. About 262 km in a straight line from Sapporo.
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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.