The cosmic adventure begins when Nobita, frustrated by Doraemon’s strict lectures and Gian and Suneo’s relentless bullying, impulsively decides to run away from home. Utilizing one of Doraemon’s secret gadgets, the "Spacewalker," Nobita intends to isolate himself in the peaceful, endless void of outer space. However, his rebellious getaway hits a catastrophic snag when Doraemon, Shizuka, Gian, and Suneo track him down just as a freak spatial anomaly tears through the cosmos. The anomaly violently consumes them, dragging the entire group into the uncharted, mysterious depths of a
distant galaxy, far beyond the reach of human knowledge or rescue.Stranded in an alien sector of the universe, the five children are quickly rescued by the crew of a colossal, sleek interstellar passenger ship known as the "Noah." The ship is captained by the charismatic yet secretive Colonel Orion, who is accompanied by his loyal, synthetic first mate, Rick. Orion explains that the Noah is navigating a perilous pilgrimage to the legendary Planet Utopia, a sanctuary rumored to be a paradise of absolute freedom and boundless pleasure. Desperate to escape their mundane lives, the kids are immediately seduced by the ship's lavish atmosphere,
advanced technology, and hedonistic adult-oriented entertainment suites, where all inhibitions are willingly shed under the glowing neon lights of the stellar lounges.As the voyage presses deeper into the galaxy, the dark reality behind Utopia's seductive facade begins to unravel. Nobita discovers that Colonel Orion’s true motivations are far from benevolent; the captain is actually an interstellar fugitive seeking to sacrifice the innocent Earth children to awaken an ancient, slumbering cosmic entity capable of rewriting the laws of physics for ultimate power. The atmospheric tension spikes into high drama when Gian and Suneo, corrupted by the ship's intoxicating allure, briefly turn against their friends, seduced by promises of supreme authority in the new cosmic order.Heartsick and betrayed, Nobita rallies with Shizuka and Doraemon, whose advanced gadgets fail one by one against the cosmic horror. In a desperate, high-stakes climax, Doraemon sacrifices his dimensional pocket to trigger a localized black hole, neutralizing the entity and shattering the Noah. As the ship crumbles into stardust, the children reconcile, realizing that true freedom isn't found in escapist fantasies. Barely escaping in an emergency pod, they chart a course back to Earth, forever changed by their harrowing maturity into the vastness of the universe.