Kiri Mukae is a 17-year-old high school student and member of the idol group Ongaku Shoujo. She possesses dark violet hair, violet eyes, and stands 1.62 meters tall, with a birthday on January 17. Kiri is the older sister of fellow group member Uori Mukae. Their parents run a kimono shop and enforce strict oversight, requiring Kiri to live at home instead of the group's dormitory. Characterized by frail health, Kiri nonetheless debuted as an idol alongside her sister, forming a dedicated sister unit within the larger group. Her family's kimono shop background shaped the distinct Japanese musical style of her character songs, including "Jiyu no Sora e" and "Dreaming Edelweiss," the latter incorporating themes of the Edelweiss flower's symbolism. Kiri shares a deeply affectionate bond with Uori, who expresses strong devotion to her sister. The narrative presents Kiri's health status and family circumstances as key factors defining her role within the idol unit.