Nobita stumbles into a real war he never asked for, and Doraemon can't magic his way out of it this time. The jealousy that kicks everything off, wanting something better than Suneo's toy, becomes completely meaningless the moment a fallen robot forces them into defending the planet. What starts as a kid's wish for one-upmanship becomes a desperate fight where a gadget-loving cat and an ordinary boy are the only ones standing between Earth and annihilation.
Nobita wants a robot to rival Suneo's flashy new toy, but Doraemon refuses to indulge him. When mysterious metal fragments rain from the sky, Nobita's persistence pays off: he and Doraemon piece together a massive mechanical giant they call Zanda Claus. What starts as a personal victory quickly becomes something far more serious when a strange girl named Riruru arrives searching for the robot, revealing its true purpose. Zanda Claus isn't a plaything. It's a weapon designed to defend Earth from an impending robot invasion that threatens to enslave humanity. Riruru carries secrets about the incoming threat, and the three of them find themselves pulled into a conflict larger than any toy battle Nobita imagined. The stakes escalate from childhood jealousy to global survival as they race against time to understand the machine's origins and prepare for the assault to come. This film balances Doraemon's signature humor with genuine tension, mixing comedy beats around Nobita's typical shenanigans against the weight of an alien war looming overhead. Audiences looking for the franchise's trademark warmth alongside higher-stakes adventure will find it here.