Prologue

Danny's a girl.
Alex's a boy.
One is human.
One is a fallen angel.
The question is:
Who is what?

An angel is exiled out of heaven for being rebellious, and as an idea to return, decided to become a guardian angel.
A human who is extremely clumsy and a magnet for trouble is suddenly saved in multiple situations by a mysterious person.
Who knew they were friends the entire time?