Japan's long-distance bus operators have improved the comfort level for passengers to the extent that they now offer individual compartments in coaches.

Despite fares more expensive than discount air tickets, the high-end service using luxury buses is gaining popularity among the youth and businesspeople who want to save time by traveling at night.

"I can sleep well and fully use the day when I arrive," said a 54-year-old male company employee from Tokyo, who regularly uses the service.