"I came here to hunt that, you should run away alone" One day, a high schooler, Yukimichi was attacked by an absolute perfect highschooler, Amakawa Amane. One who came to save him was.....Amakawa Amane! Raising her giant sword, "kazefuki" and defeated enemy that has same face as her, that is a "doppelganger". She told him that Yukimichi is being targeted and she'll protect him from now on. 2 thousand and four "denial formula", it's a paranormal phenomena when there's science theory that the deviate from that world, it's a formula that make a physic artificial. Source: JCafe