In the Kagami household, the old Western palm-sized mirror has been passed down from generation to generation. Akko-chan has been taught about the importance of the mirror, and when she finally receives it from her mother, she cherishes it with all her might. One day, amidst a disturbance caused by Taishou and his gang, Akko-chan accidentally breaks the mirror. She digs a grave and buries the broken pieces in the backyard. That night, Akko-chan is awakened by a flash of light and a kind voice belonging to the Queen of the Mirror Kingdom. The Queen expresses her gratitude to Akko-chan for valuing the mirror so much and offers her a gift—a magical compact mirror. Whenever Akko-chan sings the magical words, she will transform into anything she wants.