tabirai/orix rent a car

hi! going to okinawa next march and was looking to rent a car. i found orix rent a car through the tabirai website and found it pretty cheap compared to other rent a cars but i couldn’t add the option for an ETC card for both the japanese and english website.
1) anybody knows why &
2) is an ETC card really necessary for driving in okinawa &
3) how do you get it if the car rental doesn’t provide?
4) i heard you can pay in cash but is it much more cheaper if i get an ETC card?

thanks in adv 😭😭😭😭 trying to figure out how driving in okinawa works

by ZoneActive6464

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