In a kingdom gripped by fear and witch hunts, the true protectors of humanity, the Makai Knights and Alchemists, are secretly battling demonic Horrors.
Young Leon, inheritor of the legendary Garo armor, struggles with inner turmoil stemming from tragedy, while his father, German, a seasoned Makai Knight, attempts to guide him.
Meanwhile, Prince Alfonso, initially seeking to protect his people from within the kingdom, is betrayed and forced to seek strength and allies outside its walls.
Their paths intertwine as Leon and Alfonso navigate the growing threat of Horrors and the political intrigue of the kingdom, shaping each other's destinies in unexpected ways.