In the anime "Monster Strike the Animation," the Angelic Guard, protectors from the heavens, are assigned to gather orbs scattered across the world. Lucifer, a defiant leader of the Angelic Guard whose strength is matched only by the Almighty, undertakes this duty alongside Uriel, another key leader. During their mission, Holy Magistrate Keter, who oversees the heavens under the Almighty's command, informs Uriel of rumors that Lucifer plans to rebel. Initially skeptical, Uriel starts to find clues that the accusations against Lucifer might be linked to a past incident that nearly caused the heavens' destruction.