In May, I went on a hike to Mount Takahata (高畑山) and Mount Kuratake (倉岳山), in Yamanashi prefecture.
Here is a map of the path I walked (download KML):
I started at Torisawa station (鳥沢駅) in Otsuki, on the Chuo Main Line. The 2 mountains are on the other side of the valley from Mount Ougi and Mount Momokura. In better weather, the summits would have offered a great view on Mount Fuji. I still got a glimpse though. After Mount Kuratake, I followed the ridge until I reached Mount Daimaru (大丸). I then followed the trail down the mountain until Shiotsu station (四方津駅), in Uenohara. When I came in the morning, I was intrigued by a large tunnel-like inclined structure next to that station: It turns out is is called the Commore Bridge and is a 200m elevator/escalator combination leading to an area called Commore Shiotsu. I went up there while waiting for the train back to Tokyo.
This page can serve as a reference to reach the trailhead (at the end, it goes a bit further after Mount Daimaru than what I did).
Above, Torisawa station in the morning.
Above, the tunnel to cross the tracks.
Above, on the other side of the rail tracks.
Above, the start of the trail. It looks closed but the door on the right is actually open.
Above, view of Mount Ogi on the other side of the valley.
Above, summit of Mount Takahata.
Above, Mount Fuji with a few clouds.
Above, summit of Mount Kuratake.
Above, Mount Momokura.
Above, Mount Ougi.
Above, Mount Takatsukayama (高柄山).
Above, Commore Bridge at Shiotsu.
Above, inside the Commore Bridge. The escalator is only open during rush hours so I took the elevator.