Akko-chan is a lively and energetic fifth-grade elementary student. Her father works as a newscaster, and her mother is a picture-book writer. Akko always treasures the palm-sized mirror her father gave her, treating it with great care. However, her absent-minded mother accidentally breaks the mirror. On a night with a beautiful full moon in the sky, Akko-chan buries the mirror fragments in the garden and goes to sleep. She is awakened by a soft, kind voice belonging to the Queen of the Mirror Kingdom. The Queen expresses her gratitude to Akko-chan for caring for the mirror and gives her a magical compact mirror. Whenever she sings the magical words, Akko-chan will be able to transform into anything she wants.