Synopsis
Nobita's mom tells him a story of 2 men who stole her mother's valuable diamond when she was a child (so they don't have it now to sell for lots of money). Nobita and Doraemon go back into the past to stop the theft.
Nobita's mom tells him a story of 2 men who stole her mother's valuable diamond when she was a child (so they don't have it now to sell for lots of money). Nobita and Doraemon go back into the past to stop the theft.