There are weapons called Fragments. There are millions of them, which put together could create a weapon that could destroy everything. A thousand years ago, 5 students who possessed emence power went on a journey together, but they were ambushed.The fifth student, Elena Grey was possessed by what was believed to be a demon, and began to track down the Fragments, to create the death machine Obsidian. The four remaining students fought it wherever it went, and were finally able to defeat it. Those people were hero's. That was a thousand years ago, a story know worldwide, and celebrated. To the present day, all five of those students have reincarnated, without memories of the events of their past life, but with their power. Out of those five there has always been a demon inside one, and when it is identified who… …they must die for the safety of their world.