Harris serves as the narrative's primary antagonist, distinguished by blonde hair and a white cloak reminiscent of Reinhard from *Legend of the Galactic Heroes*. In a dystopian world submerged underwater where humanity survives on floating cities, Harris fixates on capturing the centuries-old vampire Ei. He aims to extract and harness Ei’s vampirism, believing its distribution among humans is essential for their survival in the harsh environment.

Harris relentlessly pursues Ei, triggering confrontations with the human protagonists Glasses and Hairband. This pursuit fuels the central conflict, forcing Ei and the humans into perilous situations, exposing underground conspiracies, and directly catalyzing their flight as fugitives.

Characterized by impatience and a straightforward villainous persona, Harris embodies a conventional antagonist archetype. His strategic decisions lack creativity, rendering him susceptible to being outmaneuvered due to this impulsivity. Harris functions solely to instigate conflict and embody the threat facing Ei and the human protagonists, without elaboration on his origins, personal history, or character evolution.