4 different places - which pass?

Hi

Me and a group of friends are travelling to japan in January.

We will be starting in Tokyo for 4 days, then going to hakuba for 6 days, then kyoto for 2, osaka for 2 and then back to Tokyo.

Which railways should we get? Is there a special 4 or 5 ride flexible pass for this area? Or do we need to get the complete japan rail pass?

Your help would be much appreciated, thanks

Rick