Kisaragi Akiba  

, 秋葉 キサラギ

In her youth, Kisaragi was renowned as a musical prodigy. Following a devastating separation from her three offspring, she took in Reika and nurtured her as her protégé. Eventually, after determining that Reika had reached the pinnacle of her abilities, Kisaragi established a music academy and selected an elite group of students for "Class S".