In a world where witchcraft users are hunted by the Valiante Kingdom, secret defenders known as Makai Knights and Alchemists protect humanity from soul-devouring Horrors. Leon Luis, a young Makai Knight inheriting the legendary Garo armor, grapples with his mother's tragic fate at the kingdom's hands. Guided by his father German, also a skilled knight, Leon confronts his inner demons while training to battle the rising Horror threat. Meanwhile, the kingdom's prince Alfonso faces betrayal and exile, embarking on a quest to regain his rightful place. Alfonso's path intertwines with Leon's, setting in motion a destiny-altering journey for both.