The Sacred Beast Cosmos is born, and its queen has been chosen. After a brief stay at the Sacred Bird Cosmos, the fledgling cosmos has become hospitable and manifested its first planet. The new Queen and her aide monitor their growing if lifeless realm together in their newly built palace. One day, a powerful entity calling himself "the Emperor" invades the Sacred Bird Cosmos to conquer it for himself. He separates the Sacred Guardians and converts the residents of her home planet into monsters. With the weakening Queen forced into hiding, Rosalia hurries to the Queen of the Sacred Beast Cosmos for assistance. Rosalia gives the protagonist clothes for combat and a legendary rod, Ellicia the Gray, to prepare her for her journey. The protagonist must locate her allies and rescue the Queen of the Sacred Bird Cosmos from the Emperor.