Hokkaido Sapporo, Hokkaido
Relaxation Spa Alpa Hotel Emisia Sapporo
リラクゼーション スパ・アルパ（ホテルエミシア札幌）
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Super sento (large day-bath complex). Water source not checked; see the official page
Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
タトゥーのあるお客様について タトゥーカバー1枚（8cm✕12cm）でカバーできる場合に限りご入浴いただけます
In short: Tattoos must be fully covered.
Where it is
Hokkaido region, Hokkaido prefecture. About 10 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.