This is so different, sadly, from many famous spots in Japan these days where there are too many other people, touristy geegaws, buses and plastic junk.
Still, Japan being such a mountainous and forested place, there are many places where in fact you can get away from it all.
Shugendo monks worshipped here starting in the 12th century. Being great stoics, the freezing cold water was a great attraction.
Stangely, there is a statue of a fire god in the waterfall.