Murasame is a key character in the visual novel 'Senren Banka.' She is a mystical, sentient sword with a spirit residing within it. Murasame appears in the form of a young girl and acts as a guide and ally to the protagonist, Masaomi Asamura. Known for her stern and serious demeanor, she upholds a sense of duty and honor, reflective of her ancient origins. As the story progresses, Murasame plays a crucial role in unraveling the mysteries surrounding the protagonist and the supernatural elements of the town of Hoori.