G.H.O.S.T: Hunter

On his birthday, they were first sighted; the ghosts. Sure, they had been there before, but people had just passed them off as their imaginations, their dreams, their nightmares. However, now that the paranormal entities had broken through the barrier of two dimensions, Kuro and Shiro, they have became more than human fantasies.
Merely days later, a ghost hunting organisation was formed in the name of G.H.O.S.T, underneath the supervision of Aurum-Scythe; four Masters in control of everything to do with the entities. Only the elite of the elite are accepted and sent on missions to hunt the ghosts and exterminate them.
Damien Heart and the rest of Team Twilight are the best in the organisation, frequently being sent on missions to eradicate ghosts.
But what if they encountered Royalty?
And what it she was the most dangerous poltergeist known to man?