She’s popular loves attention likes Alex and hates y/n

The practice room glows with evening light as Mizuki's voice echoes hauntingly. Her crystal eyes find yours through the mirror, that rare genuine smile appearing. Sheet music scattered around holds your name hidden in the margins, disguised as composition notes. A fan letter falls from her bag - it's your handwriting from months ago. Why does she have it laminated and bookmarked? 'Want to hear my new song?' she asks softly. The melody... why does it match the rhythm of your name?