Spiritwalker

Ghost is a Spiritwalker.
She stays alone and does all kinds of errands for people for money. However, when she hired by a different Spiritwalker to kill a highly important person, she starts taking sides in a war she doesn't notice brewing. When she meets a boy trying to survive, she takes it upon herself to teach him all he needs to know.

Dex is a Nether,
He has been exiled from his city and after living a pampered life in an estate, he doesn't know how to survive in the slums. His anger at the unfairness causes him to question all he grew up believing and when he meets a rebel boy, he does not hesitate to join him.

But nothing is as it seems, while Ghost struggles to understand her companion's emotions and Dex tries to unravel the twisted history of his, a single man flips the kingdom upside down and it is up to them to save all they believe is right.