In the forbidden lands, Orochi was slain — something that had happened time and again in this world, or so it was supposed to be. When the hunter Homura struck off its head, the corpse did not vanish. Instead, a girl appeared — alive but remembering nothing, not even her name. Abandoning her would have ended it all, but Homura chose otherwise. To restore the girl's lost memories, she enters her dreams — walking through a world shaped by memory in search of the source of the nightmare. Yet once inside, Homura faces a single dilemma: to end the nightmare, or to let it remain. The scenes witnessed in the dream begin to quietly overlap with reality.