rohibited, but there is nothing stopping you from camping in one of the observation huts along the way. In fact, like many such huts in Japan, locals have stashed a couple of ground mats in the rafters of one roughly 2/3 of the way up, just past the Yatate Jaya Teahouse.
You can also ask the resident monk at Jison if you can camp on the grounds, if you want to get an early start; there is a little graveled area, just beside the toilets, on which he'll probably let you sleep
