Osaka-Kyoto-Tokyo

Hi :) Just want to ask if its a good idea to get a 7 Day Pass. Here's our itinerary.

May 1 - Arrival in Osaka
May 2-3 Osaka
May 4 - Travel to Kyoto
May 5 - Kyoto
May 6 - Travel to Tokyo
May 7 - 10 Tokyo
May 11 - Departure Tokyo

Can we use the JR Pass in the public transport in Osaka, Kyoto and Tokyo as well?

Thanks. Hope to hear from you soon.