Fed up with being the slowest and weakest kid around, Nobita Nobi escapes into dreams through a Doraemon gadget that plays whole dream worlds from cartridges. In the one he chooses, he becomes Nobitanyan, the swordsman a prophecy says will save the kingdom of Yumirume, while Shizuka plays its princess, Shizukaria. The dream turns dangerous when the spirit army of the demon emperor Odoroom sets out to conquer the kingdom, and Nobita calls his friends in to fight at his side.