Kiyotaka Narumi

This enigmatic figure is Ayumu's older brother, admired for his seemingly perfect abilities. He achieved world-class status as both a pianist and a detective. Despite a marriage to Madoka, he departed shortly after. He holds a significant, yet mysterious, role in Ayumu's self-doubt through his past. After investigating the Blade Children, his fate became a central mystery, only to be revealed to Ayumu, leading to a significant discovery.