Personally I think HyperDia is too highly evaluated
(despite its various problematic issues)
by Japan Guide and some regular posters of this forum.
"Nagoya Airport" may refer to another airfield [NKM]
than Chubu Centrair International Airport [NGO].
(And the both are actually outside Nagoya City.)
Centrair Airport and Nagoya City are connected
by Nagoya Railroad (better known as Meitetsu) lines.
to Gifu Hashima station Where exactly is your first destination?
Is Gifu-Hashima Station really the closest station?
Just near Gifu-Hashima Station of JR Shinkansen
is Shin Hashima Station of Meitetsu,
which you can reach by Meitetsu lines only,
i.e. without Japan Rail Pass.
Are you doing a lot more train travel to make savings?I too wonder how your whole itinerary is.
Maybe you are going to buy and use a Japan Rail Pass
while actually there is a better option.
You can turn in your Exchange Order for your Japan Rail Pass
at Central Japan Travel Center in Centrair Airport.
The business hours are from 9:00 to 20:30.
https://www.tourist-information-center.jp/chubu/nagoya/en/Alternatively you can visit JR Tokai Tours Nagoya Office,
which is along the Central Walkway of Nagoya Station
and open from 9:00 to 19:30.
does anybody know if there are ticket counters with people selling tickets at Hashima station? You can get your Shinkansen reserved-seat tickets
issued together with your Japan Rail Pass.
You had better to pay more attention of station names.
There is no railway station called as Hashima Station.
Around Nagoya Station (of JR) are
Meitetsu Nagoya Station,
Kintetsu-Nagoya Station,
and also Nagoya Station of subway.
In some urban areas in Tokyo,
there are more complicated railway and shopping complexes.