Japan is 25th largest country in the world and you have a far too ambitious itinerary.
Why would you arrive at Narita and then immediately take Shinkansen to Kyushu? Makes no sense. Better to land at airport on northern part of Kyushu (think its Kita Fukuoka).
A week in Kyushu should suit....lots to do, Nagaski is much prettier and more historic than Hiroshima IMHO. Do the circuit from ...



