In the park where they normally meet, Suneo invites his friends to his trip to Express Train. Nobita then appears looking very worried as Doraemon has been missing for a few days. Nobita returns home to see that Doraemon is back. Doraemon explains that he had acquired tickets for a Galactic Express Train from 22nd century. The train's destination and travelling time is unknown. After Nobita expresses concerns about missing school, Doremon reassures him that he will board the train and come back in the same day.