An idealistic and charismatic young girl coming from a ridiculously rich family, Kokoro dreams of making the entire world smile from music. She effortlessly attracts others to her due to her bright and bubbly nature and often manages to get them swept up into her easygoing pace. Because of her naturally imposing personality, she is often able to do and get what she wants. She is also extremely curious and easily amazed, charmed by new things she discovers in the world around her.