"Doraemon: Nobita's the Night Before a Wedding" centers on Nobita Nobi, a perpetually unlucky and academically struggling boy, and his robotic cat companion, Doraemon, who travels from the future to assist him. The story begins with Nobita encountering a mysterious young woman named Riruru, who claims to be his fiancée from the future. This revelation shocks Nobita, as he has always harbored feelings for his childhood friend, Shizuka Minamoto. Riruru insists that Nobita must marry her to prevent a catastrophic future event, but her motives and origins remain unclear. As Nobita grapples with this unexpected situation, Doraemon investigates Riruru's claims using his futuristic gadgets. The narrative unfolds through a series of comedic and heartfelt moments, as Nobita tries to reconcile his feelings for Shizuka with the responsibility Riruru imposes on him. The story delves into themes of love, destiny, and the consequences of one's choices, as Nobita is forced to confront the idea of a predetermined future versus the freedom to shape his own path. The plot thickens when it is revealed that Riruru is not entirely human but a creation of advanced technology, designed to ensure a specific future outcome. Her presence raises questions about the ethics of manipulating time and relationships. Throughout the story, Nobita's friends—Shizuka, Gian, and Suneo—play supporting roles, offering both comedic relief and moments of genuine support as Nobita navigates his dilemma. The climax involves a race against time to prevent the catastrophic event Riruru warned about, with Nobita and Doraemon using their ingenuity and teamwork to resolve the situation. The resolution emphasizes the importance of personal agency and the value of genuine human connections, as Nobita ultimately chooses to follow his heart rather than succumb to a preordained fate. The story concludes on a hopeful note, reinforcing the enduring bond between Nobita and Shizuka while leaving room for future adventures.