Kanto Ota, Tokyo
Sakurakan
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Neighbourhood sento (public bathhouse) with sauna. Bathhouse; the facility describes black hot-spring water

Tattoo rule
What the official page says
刺青・タトゥーのある方の利用時間は、浴場フロア・2階飲食フロアともに 開店〜17時まで となります。(6cm×6cm以内のタトゥーは17時以降もご利用いただけます)
Guests with tattoos can use the bath floor and the second-floor dining area from opening until 5 pm. A tattoo within 6 × 6 cm can also be used after 5 pm.
Tattoos are allowed until 5 pm. After 5 pm only one small tattoo (within 6 × 6 cm) is allowed.
Plan your visit before 5 pm if your tattoos are larger.
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.