Mio Kofune

Mio Kofune is Ushio's younger sister and a first-year high school student. She is good at sports, belongs to the swimming club, and has tanned skin. Despite the death of her older sister, she has a healthy side, such as her cheerful attitude toward Shinpei when he returns home. Mio is a young girl with medium long black hair and blue eyes. She also has a tanned skin.