“From the navy to the navy, the key point of protection in the Sea of Japan.” Maizuru City, Kyoto Prefecture, applied a catchphrase to the uninhabited island of Jajima (meaning Snake Island) in Maizuru Bay and applied to the Japan Tourism Agency's project to create a tourism resource, and it was selected. The government will investigate the site of Snake Island, where there are records from the Middle Ages and the former Japanese Navy's gasoline depot, to see if it is possible to restore the castle and open excursion boats.