Hello Kitty Shinkansen has been running since 2018 between Shin-Osaka and Hakata; the train has been in operation for a lot longer than I would have guessed. Hello Kitty Shinkansen will be replaced with ONE PIECE Shinkansen.

There is only one Hello Kitty Shinkansen, and it runs only once a day between Shin-Osaka and Hakata. There are three different ONE PIECE Shinkansen (Setouchi Blue, Tony Tony Chopper, and Monkey D. Luffy), so there are three ONE PIECE Shinkansen running between Shin-Osaka and Hakata daily. The car #1 of Hello Kitty Shinkansen is Hello Plaza, which is an open public space without passenger seats, has Hello Kitty displays, including a movie on a large screen, and a Hello Kitty souvenir shop. ONE PIECE Shinkansen does not have such an open public space on board.

ONE PIECE Shinkansen