The story follows Kakujou Youkuo his fifteenth birthday in a seemingly normal world where medical technology has sky rocketed and is now able to translate... more>> any human organ. Those behind this are called the Ame No Tori (Rain of Birds). But it all turns out to be a plot against humanity where the new tech can take over its host and thus making them into a killing machine. A task force called the Jackalope are set on annihilating them before they raise more havoc and so Youkuo's new life begins. <<less