Haruka has synesthesia. This means that whenever she hears sounds, she’ll also see different colors depending on the sound. This could explain why she’s so good at creating songs that match the singer’s personality and why they are associated with different colors. Also, this could be why she had trouble adapting to life in the city because all the noises created so many colors and she became overstimulated.
In your opinion Is Reiji jealous easily of Haruka? I intend both game and anime.