Saichi Sugimoto, the protagonist of the series Golden Kamuy, is a battle-hardened soldier who served in the Russo-Japanese War. Known as 'Sugimoto the Immortal,' he earned his nickname due to his incredible resilience and survival instincts. After the war, he embarks on a quest to find hidden Ainu gold to fulfill a promise to a fallen comrade's widow. Sugimoto is determined, resourceful, and driven by a strong sense of justice, which often leads him into dangerous situations. Throughout the series, he forms an unlikely partnership with an Ainu girl named Asirpa, which becomes central to his journey.