A millennium has passed since the end of the War of Three Worlds. Curious of its long-buried origins, Princess Elise and her close friend, Theoneus, travel to the world that instigated it: Helheim. However, the two quickly learn there is far more to the truth after awakening the God of Death. Together, the three must put aside their differences and find out the true culprit behind the devastating war and the Three Worlds of Aionue.