Suggestions on whether to get a JR pass or not?

Hello,

I have 4 adults travelling to Japan in May. We land at Haneda airport then into Tokyo for 7 days then we are catching the bullet train to kyoto then to Osaka thne onto hiroshima before having to catch the bullet train back to tokyo for our flight home. We are in Japan for 15 days including the days we fly in and out.

I was wondering if it would be worth it to buy a JR pass?

Thank you,
Tyla