Nobita Nobi's experiences in "Doraemon: Nobita's the Night Before a Wedding" begin with intense emotional distress after seeing Dekisugi express affection toward Shizuka during a school play. This triggers deep-seated insecurities about Shizuka's feelings and his self-worth, driving him to seek reassurance about their future together. To verify if he marries Shizuka, Nobita travels to the future with Doraemon, arriving the day before the wedding. He observes his adult self navigating the pre-ceremony hours. This future Nobita demonstrates responsibility and compassion during an encounter with a lost cat. He and Shizuka undertake a determined effort to return the animal to its owner before an international flight, coordinating with Gian and Suneo. Their mission faces challenges including a car running out of fuel and a race through the airport, testing their resolve. Later, adult Nobita attends a bachelor party hosted by Gian. After the celebration, he gazes at the night sky in quiet reflection. This introspection surfaces childhood memories, particularly his profound bond with Doraemon, culminating in a heartfelt sigh of the robot cat's name. Throughout these events, the younger Nobita and Doraemon remain unseen observers, witnessing his future self's actions and emotional state. A pivotal conversation occurs between Shizuka and her father on the wedding eve. Shizuka's father recalls her childhood and reflects upon Nobita's inherent kindness and sincerity—qualities underpinning Shizuka's decision to marry him despite perceived shortcomings. This endorsement highlights Nobita's enduring positive traits. The narrative concludes with confirmation of Nobita and Shizuka's marriage.