Kansai Shirahama, Wakayama
Hotel Sanrakuso
ホテル三楽荘
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
ただし、市販のカバーシールを貼って、タトゥー・刺青が完全に覆える場合に限り、大浴場をご利用いただけます。
In short: Tattoos must be fully covered with cover stickers.
Where it is
Kansai region, Wakayama prefecture. About 115 km in a straight line from Osaka.
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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.