Hiroshima 3/30-4/1 (2nights) Do you plan to go also to Miyajima Island?
Then,
it sounds better to be there
on a day among the 4th to 7th of April (2019),
because the difference in the tide level is expected to be large,
with a high tide over 300 cm in the morning
and a low tide below 100 cm in the evening,
which would be good to watch Grand Torii Gate of Itsukushima Shrine.
You might hope to take a domestic flight at a discount price
from Hiroshima [HIJ] to Tokyo Haneda [HND].
https://www.japan-guide.com/e/e2364.htmlIn that case,
unless you add a trip,
the above-mentioned Kansai-Hiroshima Area pass
would not greatly save your cost
for your trips in this area and your train ride to Shiraichi Station.
Example of revised itinerary:
3/25
: Arrival in Kansai Airport [KIX].
Until 3/31: Kyoto (6 nights).
Until 4/ 2: Nara (2 nights).
Until 4/ 5: Osaka (3 nights).
4/ 5
: Leaving Osaka in the early morning.
: Traveling for Hiroshima.
Until 4/ 6: Miyajima (1 night).
Until 4/ 7: Hiroshima (1 night).
4/ 7
: Leaving Hiroshima in the early morning.
: Hiroshima Sta. --[JR Sanyo Line]-- Shiraichi Sta.;
currently the operation is suspended partially on the way,
which is expected to be resumed by September 2018.
: Shiraichi Sta. --[bus]-- Hiroshima Airport [HIJ].
http://www.hij.airport.jp/template/timetable_jr_bus_e.html: Taking a flight to Tokyo Haneda [HND].
Until 4/15: Tokyo (8 nights).
4/15
: Heading back to Osaka, mainly by the Shinkansen.
Until 4/18: Osaka (3 nights).
4/18
: Departure from Kansai Airport [KIX].