The lonely dragon Oragon is called on to help rescue the Strike World from destruction. Along the way he hears stories of the legendary monsters who will aid him, among them the fallen angel Lucifer, Arthur, known as the Knight of Knights, and the mage princess Solomon. Built as an omnibus, the series presents a range of stories starring monster characters from the Monster Strike mobile game, mixing action, comedy and fantasy. One of its tales centers on the Angelic Guard of the heavens, whose leaders Lucifer and Uriel are sent to gather orbs scattered across the world. Their mission is shaken when Holy Magistrate Keter warns Uriel that Lucifer is plotting a rebellion. The storyline stands apart from earlier Monster Strike anime seasons, and the run includes an Episode 0.