If I miss my Shinkansen or JR Express train, should I buy a new ticket?
Reserved seat tickets: You can take the next train on the same day. However, you will have to sit in the non-reserved seats. If you wish to reserve a seat, please buy a new express train ticket at the station.
Non-reserved seat tickets: You can take the next train on the same day.
For Narita Express (N'EX), please refer to this FAQ.