Nakayamadaira, Naruko Onsen, Osaki, Miyagi
Shintoro-no-Yu
A simple bathhouse known for sulfur-rich water cooled through wooden troughs before it reaches the baths. The facility explicitly refuses entry to people with large or conspicuous tattoos; the policy does not confirm that smaller or covered tattoos are accepted.
Check before bathing
- Opening hours
- 09:00–20:30; last admission 20:00. Adult admission ¥500. A July maintenance period is announced separately each year.
- Tattoo policy
- Large or conspicuous tattoos are refused. The published rule does not guarantee entry for small or covered tattoos; confirm directly if this may affect your visit.
Spring & water temperature
- Spring-source temperature
- Not published.
- Bathing temperature
- Not published.
- Spring source
- Shintoro Onsen.
- Spring classification
- Sulfur-sodium bicarbonate-chloride spring; low-tonicity, alkaline and high-temperature.
- pH
- 9.3.
- Water handling
- High-temperature source water is cooled through wooden troughs before bathing. The facility describes the baths as 100% source-flowing. A current fixed source temperature and bathing temperature were not published.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
