Manten no Yu is a natural hot spring super sento beside Sōtetsu Kamihoshikawa station, decorated as an old Tōkaidō post town. The outdoor rock bath uses spring water drawn on site. The sauna runs automatic löyly every hour, alongside a 50 °C steam room, a mint-scented cold bath and themed löyly events such as roasted-tea löyly. Open 6:00 to 1:00 (last entry 24:30); adult entry is ¥1,100 on weekdays and ¥1,200 at weekends.