While walking home, Mikiya Kokutou comes across a familiar sight: Shiki Ryougi standing by a railing amidst the falling snow, just as when he first met her four years ago. While the two talk of their past and shared experiences, Mikiya realizes that something is strange about Shiki; rather, this is not the woman he has come to know, but an entirely different entity that dwells within Shiki's body...