A hot spring that gushed out from 2,000 meters underground in February 2019. It is a dense hypertonic hot spring containing a large amount of hot spring components, matured over a long time in the strata from ancient seawater. The texture of the water has a salty film sensation, enveloping the skin. After bathing, the body warms from the core, with high heat retention, preventing chills, hence also called 'Netsu no Yu' (Hot Water). Said to have a strong blood pressure-lowering effect, it is recommended for those concerned about blood pressure. In the open-air baths 'Ue no Yu' and 'Shita no Yu', you can spend a peaceful time while gazing at the sea, which changes its expression daily. The salt content characteristic of chloride springs promotes sweating, and bathing before the sauna enhances the sweating effect.