I can't Remember

A 15 year old girl by the name of Cassidy hamada is a person with a big heart and a hard past, her mother died, and it's just get and her father and her sister now. One day when she's walking home from school she, saves a kid from getting hit by the car only to get hit herself, she loses her entire memory, of people, except for 1, her father, everyone else is gone from her mind, even her mother that died, she rembers everything else except people. every memory of a person is gone, except for her father, now Cassidy has to go back to school and regain all of her memories while strugling with the pain she feels.