You can reserve your seat without paying any extra cost from the JR Ticket Office Train Station.
The Sonic limited express travel along the coast of Kyushu, from Fukuoka to Beppu and Oita in Japan. You can choose a reserved seat, unreserved, or luxury seat.
During our trip, the train was not full and travelers can seat anywhere they want. You can make a reservation online by clicking the link below.
JR-KYUSHU Train Reservation