This is a short story meant for dirty minds

Ten years ago, a mysterious special area known as "Hell's Gate" appeared in Tokyo, altering the sky, damaging the area and making it inhabitable. The real stars disappeared and were replaced with false stars. With the gate and fake stars came Contractors, human's with supernatural abilities, each one had a corresponding star that reacts with their abilities. The Contractor's were kept secret from most of the human race and are known as "Brutal Killers" to the few humans that do know. Contractor's have no emotions and they each have a distinct price they pay for using their abilities. Organization's like the MI6 use Contractors as spies and assassins resulting in violent acts. KS306, also known as Kaede is a Contractor and works for no one. The Syndicate is after her and will stop at nothing to get their hands on her dead or alive. What will happen when they send their most skilled Assassin BK201 to bring her back?