Symbiotic Cyborg

Ever since Portia was abandoned by her parents, she was an outcast, neglected by society and even the social welfare service taking care of her.
In a world where everyone by the age of thirteen bonded with one mythical creature or another, she was sixteen and still had nothing, apart from the cheap birthday present given to her by her caretaker on behalf of her parents, whom she loathed by then, so sold it...