JRPass

Short trip to Japan - Should I buy a JR Pass?

Hello. I will be on a short trip to Japan. My itinerary is as follows:

Day 1 – Arrive Ôsaka, then move to Okayama
Day 2 – Stay Okayama
Day 3 – Move from Okayama to Kurashiki (and eventually back to Okayama)

Day 4 – Move to Shôdoshima (and eventually back to Okayama)
Day 5 – Move to Hiroshima and stay Hiroshima
Day 6 – Move to Kure and stay Hiroshima
Day 7 – Move to Kôbe and stay Kôbe
Day 8 – Move to Nara and stay Nara
Day 9 – Move to Kyoto and stay Kyoto
Day 10 – Move to Ôsaka and stay Ôsaka

Day 11 – Depart from Ôsaka back to Europe

Does the JR Pass make sense when using it from Day 4 to Day 10 ? Or is Buying individual tickets less expensive.

Any suggestions?

Thank you very much in advance. taihen o-sewa ni narimasu ( <- I hope it's correct Japanese :-)

Axel, from Germany