Hi Wilson Lee,
I was looking for the best options for your itinerary and wondering if you arrive at Kansai/Osaka airport or somewhere else. This can make a difference for using the JR Pass.
Assuming you do arrive at Osaka, its quite hard to match a JR Pass at your current itinerary. The price of normal tickets is just below the cost of a 14 day JR Pass and the longer routes are too far apart to use a 7 day JR Pass on.
That said, if you could plan it in such a way that travel to Hiroshima, Nagoya and Tokyo is covered, then a 7 day JR Pass could be useful.
For instance:
Osaka 2n
Kyoto 4n
Nara 1n
Hiroshima 2n - start of the 7 day JR Pass.
Kobe 1n
Nagoya 1n
Tokyo 3n - end of the 7 day JR Pass.
Planning it like this would have your expansive Shinkansen travel within a 7 day period and could all be covered using a 7 day JR Pass.
Hope this helps,
Daniel