This is an "Orpheus" story about traumatic memory, truth and humanity - not going to hell to save your lover, but diving into the abyss of memory to salvage the tampered self.
A female college student with the ability of "retrospective perception" discovered that her flawless memory was being accurately tampered with while tracing the truth behind the "accidental death" of her best friend. She must uncover the "memory thief" lurking in the dark before she completely loses herself...