Trip to Kyoto and Tokyo

Hi,

We are 2 adults and 2 children. We will be arriving at Osaka and will need to take a train to Kyoto. We will stay in Kyoto for 5 nights and then take the bullet train to Tokyo. We will stay in Tokyo for 4 nights and then fly home from Narita (with train to airport).

Does it make sense to get a JR pass for this trip (9 nights) (if we don't do any other train trips) or does it make sense to buy individual tickets for the few train journeys?

Thanks,

Nick