Kamioka Town, Hida City, Gifu Prefecture, was once home to the Kamioka Mine, which was claimed to be the best in the East, and developed as a mining town. It was the source of one of the four major pollution diseases, Itai-itai disease, a negative aspect of Japan's period of rapid economic growth, and is recognised by people as a negative legacy. On the other hand, it can be said that this city has the potential to keep its negative legacy from becoming obsolete as a negative legacy, including the fact that the Kamiokande project is now being implemented using the former mine site, which has now been closed. The project proposes an architecture that will serve as a benchmark for a city that is beginning to walk forward and start afresh, while preventing the former prosperity and decline of the East's best-known mine from being separated from people's memories and sealed off as a negative legacy.