Carol follows a teenage girl whose life seems ordinary until she notices music disappearing from her surroundings, the chimes of Big Ben, her father’s cello playing, and even the concert of her favorite band, Gaball Screen. After hearing mysterious voices, she is transported to a fantastical world where she must battle evil monsters that are stealing music from Earth. Along the way, she is joined and assisted by three dashing heroes: Clark, Tico, and Flash.