Will the jr rail pass let me travel all over japan or just in certain regions?

Question:

also after i buy the pass is certain seats for the shinkasen free or just reduced. me and a couple of friends are planning a trip to japan and some of the places are far apart, sum in tokyo some in kyoto and sum in hiroshima, so with the jr pass could we go to those regions

Answer:

Yep, no problem. You can also ride any of the JR trains within the cities you visit. This can be a pain in the gluteus maximus in Tokyo because of private lines.

But if you are going to the places you mentioned then the JR Pass is made for you. It would be nice if you got the green pass, as those seats are larger, but you have to decide based on cost. Check out the link for more details. It's extremely clear what is not covered, such as certain typess of bullet trains and JR lines that travel on private sections of rail costing you a bit extra.