Across Luminaria, colossal beasts lie petrified, their remains overflowing with the mana that drew people in and gave rise to whole civilizations. Revering these creatures as Primordial Beasts, people shaped their lives around them and began to worship them. Now that old order gives way to war. The Gildllan Empire, which has grown rapidly through advanced technology, clashes with the Jerle Federation, an alliance of countries devoted to the Primordial Beasts. Leo, a young knight in training for the federation, sets out on a mission to Lunne, a border town once held by the empire, together with his childhood friend Celia and their instructor Lisette. There they meet Hugo, a former friend who betrayed the federation and now fights as an imperial soldier. Across two episodes, this action fantasy ONA based on the Tales of Luminaria mobile RPG centers on the clash between opposing ideas of justice.