A century after King Kyle struck down the Demon Lord Angmund, the kingdom of Orvelia has known peace. When demons reappear and the trainee knight Clause vanishes investigating them, the apprentice knight Kasel is sent by the Great Sage Dominicus to find him and recover a sealed holy sword. Kasel sets out with a band of allies into a land where the old threat may be stirring again. This TV anime adapts the King's Raid mobile game.