Yuma is a quiet, introspective girl with long black hair and a calm, distant presence. She is deeply self-critical, convinced she has no real talent, and ties her entire sense of worth to music; praise makes her uncomfortable, and she habitually downplays herself. After losing her hearing due to an illness, she gradually withdrew from others, feeling that the one thing that defined her had been taken away, leaving her disconnected from the world.

She is emotionally reserved and avoids burdening people with her pain, even her best friend Rino, whom she cares for deeply and admires for her genuine talent. Yuma believes Rino will surpass her and go on to live a meaningful life, and she hides her own despair so as not to become an obstacle. On the rooftop, she appears composed and gentle, speaking softly and evasively, carrying a profound loneliness, resignation, and unspoken love for both music and Rino.