tokyo -hakone - osaka

Hi! We plan to stay in Japan for 6 days, 3 days based in Tokyo and 3 days based in Osaka. We fly into Tokyo and exit Osaka.

Day 1 - Arrive in Tokyo; Go around Tokyo
Day 2 - Visit Disney Sea
Day 3 - See Mt. Fuji, return to Tokyo
Day 4 - Travel to Osaka; Go to Nara and back to Osaka
Day 5 - Go to Kyoto and back to Osaka
Day 6 - Go around Osaka; Depart Osaka

Should we get the JR pass or just buy regular tickets/regional pass?

Thank you!