Nobita, envious of Suneo's latest robot acquisition, implores Doraemon to craft an even superior one. Initially hesitant, Doraemon relents when Nobita stumbles upon scattered fragments of a celestial robot. Assembling the pieces unveils Zanda Claus, a colossal creation with unforeseen capabilities. The duo soon realizes Zanda Claus is not a mere plaything but a formidable weapon crucial in Earth's impending battle against the Robot Army's impending enslavement threat. With the invasion looming, a cryptic figure named Riruru emerges, her quest tied to the powerful robot.