Hitomi Karuko

This enigmatic author possesses a deadly piano, the "Pianissimo of Ecstatic Symphony," capable of killing listeners upon hearing its final note. Operating from a discreet establishment named "Velvet" in the alleyways, she manages this dangerous existence with the assistance of Houichi, who helps her run the bar, maintain her instrument, and dispose of the resulting victims. Despite being blind, her unique and perilous profession defines her life.