 Ten years prior to the story's beginning, Kurohime brought an end to a massive war fought to own and rebuild the Tower of the Gods, which once completed would allow the builder to become a god themselves.Upon completion, Kurohime destroyed the tower and entered the realm of the gods to slaughter them, as they were the ones who started the war in the first place.Through a combination of deception and brutality, the gods captured her and then split Kurohime into two beings, one representing her rage, and the other representing her compassion.