Kansai Osaka
Irifune Onsen
入船温泉
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Tattoos allowedStated by the facility
Neighbourhood sento (public bathhouse). Sento water; source not checked

Tattoo rule
Tattoos allowedStated by the facility
What the official page says
タトゥー(入れ墨)がありますが、銭湯利用できますか? はいタトゥー(入れ墨)があってもご利用頂けます。入船温泉はタトゥーフレンドリー(tattoo friendly)です。
In short: The official page says guests with tattoos can use the bath.
Where it is
Kansai region, Osaka prefecture. About 6 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.