Nobita Nobi is an elementary school student who dislikes studying, lacks athletic ability, and approaches tasks with half-hearted effort. He is easily bullied, prone to bad luck, and fearful of many things. His personality leads to a life of failure, a condition that even impacts his descendants. This situation prompts his great-great-grandson, Sewashi, to intervene. Sewashi travels back from the 22nd century to the 20th century to meet Nobita, who is startled to see him emerge from his drawer along with a blue robotic cat. The robot identifies himself as Doraemon, stating that Sewashi pressured him into assisting Nobita, with their ultimate aim being to secure Nobita's happiness. Disheartened by Nobita's hopeless condition, Doraemon decides to return to the future. However, Sewashi activates a program within Doraemon that prevents this departure. Compelled to remain, Doraemon aids Nobita using futuristic gadgets retrieved from his four-dimensional pocket—a bag that contains anything placed inside it. Can Doraemon bring happiness to Nobita and return to the future?