Is getting the JR Pass worth it for my trip?

We are a family of 3 travelling to Japan in December and we are trying to find out if it's worthwhile to buy JR Pass (specifically the Osaka-Tokyo-Hokuriko JR Pass) or individual tickets for our itinerary?

Day 1 - 6 Tokyo based (staying at Nihonbashi) + day trip to Kamakura
Day 6 - 8: Highway bus from Tokyo station to Lake Kawaguchiko + explore Lake Kawaguchiko
Day 8 - 11: Highway bus from Lake Kawaguchiko to Tokyo Station and then taking the Hokuriko Shinkansen immediately from Tokyo to Kanazawa + day trip to Shirakawago
Day 11 - 12: Hokuriko Shinkansen from Kanazawa to Tokyo

Thank you!