Is this taken?

So, I was thinking about creating an Anime that is about this high school student, but as soon as he goes to the school, a person da the name of the Smiling Killer begins to kill teachers and students around the school, and the main character tries to solve all these murders, also being aware of his own surroundings, while protecting his friends, since they are involved, they are the killers main targets. Is this idea taken, because if not, IT'S MINE! I CALLED DIBS! WINDWAKERGUY430, COPYRIGHT 2015