Akko and her mother have been living together since their father became the captain of a luxurious cruiser. One day, Atsuko accidentally broke her favorite mirror. She made a grave for it. On the same night, the sky brightens and Akko receives a gift, a compact mirror, from the mirror spirit for her kind-heartedness. Whenever she sings the magic words, the magical compact mirror will allow her to transform into anything she hopes to be.