Kanto Ota, Tokyo
Hasunuma Onsen
はすぬま温泉
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) with natural black hot-spring water. Hot spring (kuro-yu black water, per the facility)

Tattoo rule
Tattoos allowedStated by the facility
What the official page says
タトゥーが有ってもご利用いただけます。他のお客様や当施設従業員等に迷惑をかける方は利用できません。
You can use the bath even if you have tattoos. People who disturb other guests or staff cannot use the facility.
The official FAQ says guests with tattoos can use the bath.
Where it is
Kanto region, Tokyo prefecture. About 14 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.