"Mangan no Yu" in Chichibu.
Its origin is old and has a history since the year AD 824.
At the time, the area was suffering from heavy drought and was suffering great damage.
When the local people prayed with their heart together, a saint appeared and this hot spring gushed out.
By the way, "Mangan no Yu" means that "All wishes come true" hot springs.
While enjoying the hot spring, you can see the waterfall.
You can check the site of "Mangan no Yu" in Chichibu.