Jofu Falls is one of the hardest waterfalls to see in Kanto Region because it is located in the deep side of Mt. Shirane. You need a car to travel easily.
Use 292 to Tenguyama 6th parking, walk forest street (40 min.) to Observatory, walk mountain pass (40 min.) to the bottom of the falls.

You don't get lost because there is many signs on the pass but it requires hard walk on the cliff side. Be very ready for it. It the weather is not good, please don't try to visit there. Also, there is a bar, too.