Kiyume is a petite girl with shoulder-length hair and large violet irises. She is a quiet high school student who wears the school's summer uniform: a white long-sleeved shirt with the school logo, a navy blue skirt, and school shoes. She has a twin sister named Siyume. Siyume is also petite with dark brown hair and large, bright yellow eyes. Siyume is emotional and enigmatic, often getting into minor trouble at school. Kiyume is introverted and often spends her time alone, preferring to observe the world around her and engage in quiet reflection.