One morning, Nobita learns about the mysterious happenings on the Moon, where he tells his classmates that it was the Moon Rabbit, but nobody believes him. He tries to prove by imitating the rabbits by making ricecakes and hits his teacher in the process, where he gets punished. When Nobita tells Doraemon about this, who relucantly takes out "Divergent View Badge" gadget and creates an atmosphere on the Moon. Using the animal clay, they creates Moonbit and returns to their home. Later, Nobita's mother tells him to bring Susuki grass for Moon Viewing Ceremony, where he sees a boy and calls him, but the boy suddenly disappeares. The next day, a new student named Luca arrives, and Nobita gets surprised to see that it is the same boy he had seen yesterday.

(Source: Wikipedia)