Miyako Miyamura is a student at Otobane Academy in Otowa, Japan, where she lives alone following her parents' divorce. She appears as a main heroine in the first chapter of the story and later as a supporting character. Her most defining trait is an outwardly energetic and outgoing personality, often described as whimsical and unorthodox. She finds routine classes tedious and frequently skips school, preferring to follow her own impulses.

Her motivations are rooted in a deep-seated fear of loneliness and abandonment, stemming from her troubled family background. This drives her to seek intense connections with others, particularly with Hiro Hirono. Their first encounter occurs on Christmas Eve, when she steals his bicycle to chase a purse thief, accidentally destroying the bike. They spend the rest of the night together, and later discover they attend the same school. As she grows closer to Hiro, her initial carefree demeanor gives way to possessiveness and emotional vulnerability. She sees Kei Shindou as a rival for Hiro’s affection, which heightens her insecurity and manipulative tendencies.

Over the course of her story, Miyako undergoes significant development. After entering a romantic relationship with Hiro, she becomes more emotionally stable, gaining popularity among her classmates and achieving top academic rank. Her natural talents include athleticism, artistic ability (particularly drawing cats), and sharp intelligence. These abilities contrast with her earlier impulsive and rebellious behavior, illustrating a capacity for growth and self-improvement.

Her role in the narrative is that of a catalyst for Hiro’s emotional awakening and her own journey toward trust and stability. Key relationships include her romantic bond with Hiro, which challenges her fears, and her rivalry with Kei, which forces her to confront her insecurities. In ef: a tale of melodies, she appears as a supporting figure, reflecting the consequences of her earlier choices and the maturation she has achieved.