Word of Yui's extraordinary talent spread quickly, and soon, she was in high demand. The school's music club, led by the charismatic and ambitious Kaito Nakahara, approached her to join their ranks. Yui, hesitant at first, eventually agreed, and together, they formed a stunning ensemble that captivated audiences at school concerts and local events.

However, with fame comes pressure, and Yui found herself struggling to cope with the expectations placed upon her. She began to experience vivid dreams and an unsettling sense of disconnection from the world around her. The mysterious piano, now a focal point of her performances, seemed to be exerting an increasingly powerful influence over her.

One evening, while practicing alone in the music room, Yui discovered a hidden compartment within the piano. Inside, she found a letter addressed to her, written in elegant calligraphy: