Coverage Osaka-Tokyo Hokuriku Arch Pass

Hi, I would like to know whether I am correct in seeing that the above mentioned pass will be able to cover a trip of 7 days that goes from Tokyo-Osaka/Kyoto back to Tokyo. I would have to buy a separate ticket to be able to Hiroshima right? And is (check-in) luggage also covered with this pass or would I need a supplement for that? And last question to be sure, the pass always for unlimited travel right? Many thanks for your help!