Should I use JRPass on my trip?

Hello everyone,

I am thinking of using JRPass but I don´t know if I will be saving, or if I should be using another pass. I will be in Japan from January 12 through January 22. I plan on doing these train trips the fastest way so I dont lose time for sightseeing. My itinerary is:

Arrive at Narita
12-15 Ueno Tokyo
15-17 Osaka
17-19 Kyoto
19-21 Kawaguchiko (to see Mount Fuji and maybe Fuji Q if its open)
21-22 Roppongi
Depart at Narita

Thanks for your help.