(This is all canon to Mia and Me series,it's season 1.Mia still hasn't met Mo or Yuko.)

Mia just moved into her new school and her aunt gave her a book after the two entered Mia's assigned room in the school.Her aunt said that the book is a gift to Mia from her deceased parents and that it's magical.She said that the words I am Mia will help with something.

The aunt left the room to do something she had to do and left Mia in the room.Mia looked at the book and opened it.

(You're Mia.)