Hitomi Karuko  

, 軽子 瞳

The author in question has a unique talent for playing the piano, particularly one called "pianissimo of ecstatic symphony," which has the power to kill those who listen to its final note. despite being blind, she runs an unassuming bar named "velvet" and is assisted by her loyal companion, houichi, in managing the establishment, tuning the piano, and disposing of any victims that may arise from playing the deadly instrument.