Pandora by Mynameishuman
Revelations
Have you ever witnessed something so terrible, so completely and utterly, incomprehensibly awful, that as it happened it seemed as if all the oxygen was being sucked from the world - your insides being sucked away right along with it?
What if you not only witnessed it, but were the cause of it?
What if, by some sick twist of fate, the wrongs you were so desperately trying to right ended in the extermination of an entire species?
Kagome had always wondered why, exactly, her era was peculiarly devoid of long-lived youkai.
And now she knew.
She'd killed them all.