Akko's Secret (1988)

Atsuko Kagami is an elementary school girl who has an affinity for mirrors. One day, her favorite mirror is broken, and she prefers to bury it in her yard rather than throw it to the trash can. The same night in her dreams, she is contacted by a spirit. Akko-chan is then given the gift of a magical mirror, that will allow her to transform into anything she wishes.