Once upon a time, there was a family with 2 stepsisters, one stepmother and Cinder-Thingy. Cinder-Thingy was treated unequally with her family.
Cinder-Thingy's 2 stepsisters got to play and have a good time, but Cinder-Thingy has to do chores like washing the dishes and cleaning the house.
Just as Cinder-Thingy was going to get the mail there was one letter in the mailbox, she wanted to open it so bad, but she didn't hesitate, it was probably for Anna and Carly. So she went back inside to give this mysterious letter to Anna and Carly.