The Alchemist Marcus uses human souls to strengthen his own powers, seeking to achieve his ultimate goal of reigning over the domain of humanity and infernal beasts. The only obstacle in his way is God's Envoy, whom he has managed take hostage. With the final remnants of his strength, the captive tries to bring back the natural balance. The world's monasteries gather to select a hunter, who is sent to rescue the prisoner, a mission that will require defeating an army of daunting demons and devils.​