When Nobita turned the world into a world with magic with the what-if-telephone-booth-gadget, He and his world needed to defeat the threat that became reality in this world.
When Nobita turned the world into a world with magic by using the what-if-telephone-gadget, Doraemon and Nobita must worked together with their friends and a girl named Miyoko Mangetsu to defeat a threat to earth that exist in this reality