Nobita, after hearing about treasures in Egypt, uses Doraemon’s gadgets to search for them but accidentally drops his future diary. He and Doraemon rescue Nemses II, a young pharaoh trapped by a traitor, and learn that his kingdom and princess are in danger. Along with Shizuka, Gian, and Suneo, they travel back to ancient Egypt, only to discover that the villain Warueheb has seized power using Nobita’s lost diary. Now, the friends must help Nemses reclaim his throne and restore peace to Egypt.