Hagiri Ranba is a reincarnated warrior designated as the Warrior of Fire, tasked with combating supernatural threats. She wields fire-based abilities ignited by lighters or fireworks, though these powers remain largely undetailed. As a high school student, she balances this role with her civilian identity. She operates alongside other young warriors like Jingo Kazamatsuri and Futaba Amitaka within a school club focused on supernatural threats, frequently receiving advisor cautions to prioritize her studies and avoid public displays.

Her combat participation typically involves minor support against low-level kyouma, such as aiding in neutralizing a possessed bus and fighting at a pool amusement park. Her effectiveness in battle is limited, often requiring reliance on the protagonist Jutto Segu for major victories. During the final conflict against the forces aiming to free the Demon King, Hagiri contributes minimally, using her fire abilities to eliminate possessed humans—resulting in their charred bodies after kyouma expulsion. Her role remains consistently supportive throughout the series, exhibiting no significant character development, personal backstory, evolution of abilities, or individual story arcs.