In the March 1973 issue of the magazine Shogaku 4-nensei," Nobita again returns home after losing a fight against Gian. Doraemon then explains that he has to return. Nobita tries to have Doraemon stay but after talking it over with his parents, he accepts Doraemon's departure. They take a last walk in the park. After they split up, Nobita encounters Gian and gets into a fight again.
After a long duel with Nobita trying to win at all costs so that Doraemon can leave without worries, Gian gave up (which gave Nobita the win) because no matter what, Nobita refused to stay down. Doraemon finds Nobita unconcious and takes him home. Sitting beside the sleeping Nobita, Doraemon returns to the future. This story was reprinted in the last chapter of the manga Book 6.