Every student is obligated to bring one gun to school in their pockets. One bullet. One blow to end it all. Yes, they asked for it. Their parents asked for it, in order to shape them with absolute perfection; to be perfects. Hillarde High School looks just like any normal school. But it's not even worthy to be called a school in the eyes of those who know it. It's a killing center, a prison, or one can even say hell. Everyone knows that it's a highly strict and demanding institution, but that's taking it lightly. No one knows the terror; the pain. Then it all changes. They're trap in a game of revenge. They've seen blood before. Lots and lots of times. But not like this- -and it all started with a gunshot, of another student blowing their chance at becoming perfects; or so they thought. oh and darling, don't forget to play it diminuendo.