Long ago, there was a forbidden tome that threatened the balance of the world. A witch raised in a peaceful world suddenly encountered her twin from a war-torn parallel world. She had crossed the dimensional planes for help, for she had been the one who caused the disaster. They were determined to fight to restore everything as it once was. If the two worlds became one again, both would be destroyed. To prevent that, the witches required the powers of a certain species of crimson butterfly born on that fateful day.