SHould we buy a regional pass or the normal JR Pass

Hello,
We are doing some early planning again and will appreciate any help. From Tokyo, we are planning to go to Osaka,Kyoto,Kanazawa and Hiroshima and plan to buy a 7 day pass. Can we go to these places using the hirokiku pass or do we need to purchase the non-regional JR Pass. Assuming we buy the Hirokiku pass, how much is the new cost after the increase.
Thank you.
Gigi