Kasumi is a black agent of the Custos Mundi organization who is very special: she is a Yokai type ghost.
Very convenient for this secret agency to send a black agent who cannot be seen, being invisible to a majority of the population who cannot see ghosts and also, convenient to have an agent who can interact with the supernatural world.
Unfortunately, Kasumi is not an agent who is very vocal, speaking very little, must be constantly accompanied to give instructions, but especially to monitor her, being a dangerous Yokai and who gives off such a frightening aura that she becomes for some black agents the real threat to them, more than the threat they must contain or destroy during their mission.
