Caught the bus from Okutama station at 7.56 AM, get off at Minedani bus stop, crossed the floating bridge and enjoyed a very steep ascent. Very hot, drunk about 2 lt of water and I was thirsty... 

Be careful, tricky trailhead between Mito san and Gozen yama, don't get lost! Down to the Okutama lake and caught the bus at 3.11 PM back to Okutama station.