Blood Skull, a mysterious and dangerous killer organization, has a very famous reputation in the underground world, because as long as it takes on a mission, it has never failed, and no one knows how many killers there are in it, what they are like, because no one knows it no longer exists, and no one knows who the boss behind it is. They can only vaguely guess that "he" or "she" has huge financial resources to support the operation of the killer organization Blood Skull, until one day, he appeared...