Confusion with JR pass, where it can be used.

Hello,

I am travelling to Japan on the 20th May 2019 and need to buy a Japanese rail ticket. However I am confused.

This is my itinerary: Tokyo (6 days) - Kyoto (3 days) - Tanabe. Then I will do a 3 day Kumano trail before travelling from Kii-Katsurra to Osaka (3 days) incl. a visit to Mount Koya and then back to Tokyo.

• Can I use the JR pass to get from Kyoto to Tanabe, from Kii-Katsurra to Osaka and then from Osaka to Koya, or will I have to buy additional tickets?

Finally, can you use the Japanese rail pass on Tokyo's underground/metro system? The information online is not clear. I think you can use it on some lines? If so which! I will be in Japan for 15 days which a lot of long distance travelling which means I think the JR pass is the best option.

Any help would be much appreciated,

Yours Sincerely,

Yasmin