It is a day-trip hot spring facility on the side of the Yamanakako IC, and was given the name of "hongfuji no oyu" because of the fact that hongfuji can be seen before the start of winter. The large bathhouse has three bathtubs with a whirlpool bath with a temperature difference, a sleeping bath, and a hot spring bath, and two saunas, dry and mist. The large site includes a stone and a cypress and two covered open-air baths, with views of Mount Fuji from an open-air bath and a large bath. On the second floor, there are also many noodles and desserts, including set meals and bowls using Fujikeling pork. Except in July and August, there is also an entrance service to cook smelt fished in Lake Yamanaka that day.