The adventure begins when Nobita, suffering through the suffocating heat and relentless pressure of summer tutoring, accidentally discovers a strange, swirling pink mist pouring out of his closet. Drawn into this mysterious phenomenon, Nobita and his loyal robotic cat, Doraemon, are transported through a dimensional portal into a breathtaking, vibrant world inhabited entirely by bipedal, highly civilized animals.In this utopian Animal Planet, technology operates in absolute harmony with nature, and the inhabitants live in a peaceful society devoid of pollution, war, and greed. Nobita and Doraemon quickly befriend Chippi, an enthusiastic and adventurous young dog-boy who dreams of exploring the forbidden, misty mountains that border his peaceful community. Driven by curiosity and a desire for excitement, the trio defies local warnings and journeys into the dreaded mountain range.There, they uncover a terrifying secret that shatters the idyllic illusion of the planet. The
forbidden zone is actually the ruined, desolate wasteland of the "Spors"—human-like creatures who poisoned their own world through unbridled
industrialization and nuclear devastation before escaping to the Animal Planet. Now, a faction of malicious Spors, led by a ruthless trio of criminals, has returned with sinister motivations. These invaders seek to conquer the Animal Planet, enslave its gentle inhabitants, and strip-mine the lush environment to rebuild their lost empire.As the antagonists launch a brutal invasion, capturing Chippi’s family and threatening to bulldoze the sacred forests, Nobita and Doraemon step up to protect their new friends. Using an array of Doraemon’s futuristic gadgets, they rally the naive, peace-loving animal citizens, transforming them from passive victims into a unified resistance. A high-stakes battle ensues across the transforming landscape, testing the courage and inner strength of both Nobita and Chippi. Nobita, usually cowardly and lazy, finds a deep reservoir of bravery as he fights desperately alongside Chippi to rescue the captive villagers and disable the invaders' heavy machinery.Through clever strategy, sheer determination, and the power of friendship, the duo manages to outsmart the ruthless Spor leaders, destroying their technological advantage and neutralizing the immediate threat. With the crisis averted and the invasive threat permanently repelled, the balance of the Animal Planet is restored. Nobita and Doraemon bid an emotional farewell to Chippi and the grateful animal inhabitants, returning through the dimensional portal just in time to face Nobita’s mother in their ordinary bedroom, forever changed by the epic adventure that taught them the vital importance of environmental stewardship and true courage.