My guardian demon

This is the tale of Kate Grand, just a 17 years old studient that lives in Illinois alone. She had been doing a nurse service to get a schoolarship. She had a normal life but one day, she fine a man, almost death in the sidewalk of the street. He look's like a model, black long curly hair, green eyes, fit body and a misterious look in his eyes that make you wonder where he come from. Kate doesn't know but from that day all her life will change.