Onsenyado Hamayu Nagi

The indoor communal bath runs on natural onsen water that's kept flowing rather than recirculated, and some guests describe it as mild and more lukewarm than piping hot. The building is a former ryokan near Beppu Station, now run guesthouse-style with plain tatami rooms, dormitory beds, and a shared kitchen where guests cook and mingle. It shows its age and reviews on the physical condition are mixed, but the source-fed bath is the thing people keep coming back for.