An external, omniscient narrator imparts exposition and contextual information throughout the series. This voice delivers essential background on historical events, cultural practices, and character motivations without participating in the narrative events.

In the anime adaptation, this narrator provides supplementary explanations covering the Russo-Japanese War, Hokkaido's colonization, Ainu traditions, and the Meiji era's political climate. The voice contextualizes character actions and settings, such as military tactics during the Siege of Port Arthur or the significance of Ainu hunting rituals.

The live-action film adaptation employs a distinct narrator providing voiceover that aligns with its historical adventure tone. This narration details the treasure hunt premise and key plot points, maintaining the detached, informative perspective.

The narrator possesses no additional narrative function, character development, or personal background across official media. The role remains strictly expository, solely serving to bridge historical context with the story's events, exclusively providing information without involvement in the plot or character interactions.