In the story, we meet Nobita Nobi, an elementary school student who dislikes studying, is not athletic, and does everything halfheartedly. He is also a pushover, unlucky, and has many fears that make him fail in life. His failure continues to affect his descendants, including his great-great-grandchild Sewashi.
Sewashi travels back in time from the 22nd century to meet Nobita, who is surprised when he appears with a blue robotic cat named Doraemon. Doraemon claims that he has been pressured by Sewashi to help Nobita find happiness. However, after seeing Nobitas hopeless state, Doraemon decides to return to the future.
Sewashi activates a program within Doraemon that prevents him from going back. As a result, Doraemon is forced to stay and assist Nobita using futuristic gadgets from his four-dimensional pocket, which contains anything inside it.
The question is whether Doraemon can bring happiness to Nobita and return to the future or if he will be stuck in the past helping Nobita.
Motohiro Hata