Just a heads up for infrequent travelers…
My family and I have been traveling in Kyushu for the last week and a half. We've struggled with the JR KYUSHU website (https://www.jrkyushu.co.jp/english/) when booking single-trip train tickets (limited express and shinkansen). I've been unable to complete bookings when using Google Chrome, and have also been unable to complete bookings when using a VPN with a US-based IP address. In order to use the website to successfully make a single-trip booking, I've had to use the DuckDuckGo browser with a Japanese IP address. Also you should be aware that JR KYUSHU does not provide electronic tickets despite your online purchase. You will have to go to a major train station and go the Midori no Madoguchi or one of the more modern ticket machines and enter your reservation ID and the passcode that you entered when you made your reservation. Even highway bus companies in Kyushu are able to issue electronic tickets, but not JR KYUSHU.
by uenoparker1