Before the events of the story, in B.D. 2695, Professor Southern-Cross discovered the Seventh Fonon in Auldrant's atmosphere. By the year B.D. 2699, a devastating war broke out throughout the world over the power of the Seventh Fonon, which served as a means of reading the planet's memory to determine the future. This war featured the use of recent advancements in fonic weaponry that brought disastrous effect upon the planet. As a result, these devices disrupted the Planetary Storm within the planet's core, creating vibrations within the core that caused the ground to shift and liquefy, and eventually leading to the release of miasma from below the planet's surface. Yulia Jue, at age 14, formed a pact with Lorelei in order to use its power in order to save the planet. Her pact with Lorelei is held through the Grand Fonic Hymn. With the help of Lorelei, Yulia was able to restore the Kingdom of Hod. She then created the Key of Lorelei to hold the power of Lorelei, using it to rebuild the Planetary Storm. After completing this task, Yulia left the key to float within the planet's core.