The earth shattered, and the Aether surged upward. Humanity had lost seventy percent of its land and huddled on countless islands drifting in the Aether Sea, relying on 2,506 "lighthouses" to support the remnants of civilization.
The heretic inquisitor Edwards was ordered to investigate Lorit, a city cluster where the lighthouses had gone dark. From scattered clues, he uncovered the heretics' sinister plan. Determined to strike first, he traveled to an abandoned village in the snowy wastes to find the plan's key artifact, only to dig an unknown girl out of a grave.
"Will you become a magical girl?"
As the girl wept in anguish, Edwards invited her to join him. To save her, Edwards had no choice but to give in to the mysterious black cat's urging. He had no idea how much trouble one moment of compassion would bring him afterward. Once there was a first time, there would be a second.
And so the girl who made a pact with Edwards joined the Inquisitors' auxiliary unit, vowing to leave no heretics alive.
Aerial combat, infiltration, purges: the two partners traveled across several nations, seeking the truth about the heretics hidden in the mists of the Aether Sea. Unbeknownst to them, the world began to turn because of them.