The Kingdom of Illiuam and the Kingdom of Terabius finally declare an all-out war against each other pulling the curtain on any hope of peace and stability. The two factions begin to call upon assistance in drafting citizens from the ages of sixteen to forty. These few selected to serve under Illiuam must choose between becoming a K.N.I.G.H.T, a courageous and determined unit of super soldiers dedicated to the task of protecting the king under any circumstance, or an Exorcist, a purifier of spirits who entrusts their soul and spirit to their nation and AMORTH the organization established to train and enhance the Exorcist's potential. Terabius poses a threat with it's unknown military and malicious intentions, and the the "War of Duality" is just beginning to manifest an era of uncertainty. Two brothers entwined by the cruel hand of fate, separated by the oppressive shadow of war, make a promise to meet again after the conflict.