Sugimoto survived the Russo-Japanese War of the Meiji era. Gaining the nickname "Immortal Sugimoto" during the battles, he sets off to Hokkaido, the distant northern lands of Japan, where people mine for gold. Sugimoto wants to help the widow of his fallen comrade from the war. While hunting for gold deposits, he accidentally discovers the hiding place of criminals. Together with an Ainu girl who often comes to his aid, the hero embarks on a dangerous and thrilling journey.