Changed

Aria, a 16 year old girl, enjoys her life as a teenager. When her little brother got admitted into the hospital, she ate a piece of poisoned food. Overnight, she transformed into a first grader without knowing. She goes to school and is humiliated in front of her high school class. She see's a doctor and it turnes out, she could have to live her life all over again, leaving her brother in the place of the oldest sibling.