Oku-no-yu is a neighbourhood sento in Kita-ku, open since 1965 in an orange-brick building by Kita-34-jo subway station. Its water is heated with firewood and kept low in chlorine, and the sauna is a dry far-infrared gas room that costs nothing extra on the ¥500 entry. The groundwater cold bath stays at 16–17 °C all year, and a medicinal bath changes weekly with the seasons. Open 14:45–22:45 (from 13:00 on Wednesdays), closed Fridays.