The Crimson Denizens, a group shrouded in mystery from a parallel dimension, have chosen Earth as their hunting grounds, preying on innocent humans for their life force. No one is safe from their merciless attacks, leaving only "Torches" in their wake – faint remnants of souls that quickly fade from existence and from the minds of the living. In order to combat this invisible threat, the Flame Hazes relentlessly fight against these monstrous beings. Yuuji Sakai's normal high school life is abruptly disrupted when he becomes both trapped in time and the target of a Denizen. Fortunately, a nameless hunter with blazing red hair and piercing eyes comes to his aid. However, Yuuji soon realizes that he is now nothing more than a Torch, destined to vanish without leaving a trace. As he tries to make sense of his predicament, it seems as though his fate is inevitable.