Reservations are not mandatory, as same-day tickets can be purchased at Unazuki Station starting at 06:50 hours and all passengers are guaranteed seats. However, waiting times may occur during Golden Week holidays (first week of May), Bon Festival, and autumn leaf season due to congestion. Online reservations are recommended during peak periods to avoid delays. Reservations are made by car number, with seating on a "first come, first served" basis within your assigned car.