Which pass is right for us

Hi,

We are planning a 3 week trip to Japan for late September and October.

Our itinerary is as follows:

25/9-Land in Haneda and head straight to Hiroshima
Stay in Hiroshima from 25/9 to 30/09.
While there we will be doing a day trip to Kumamoto and Kurashiki.
We will go from Hiroshima to Kyoto

From 30/09 to 6/10 we will be in Kyoto.
While in Kyoto we will do day trips to Osaka, Nagoya and Wakayama.

We will go to Tokyo from Kyoto and will be there until 17/10.
While in Tokyo we will be doing a day trip to Kawaguchiko and Shiroishi.

Is a 21 day pass worth it or should we be looking into other passes?

Any advise is greatly appreciated

Thanks