Nobita desires Suneo's newest robotic toy and asks Doraemon to make an even better one, but Doraemon declines. Despite this, Nobita discovers strange robotic parts falling from the sky, and they assemble a gigantic robot named Zanda Claus. They soon realize that Zanda Claus is not just a toy, but a powerful weapon that can stop the impending Robot Army invasion and free humanity from their oppression. Suddenly, a mysterious woman named Riruru appears, searching for the robot.