Yakushi-ji is a temple in Nara, which is located in Honshu Island. It is World Heritage listed and its buildings are the second oldest wooden structures in the world. A bold plan is in progress to reconstruct the temple buildings. Today, common nails last for around 50 years. The question is: can a contemporary craftsman recreate the 1000-year nail? This program tells the story of Yukinori Shirataka, the last surviving blacksmith in Japan who can make 25-centimetre nails using traditional Japanese methods.