Messiah had long desired to enter the human realm but she could not cross through without a large source of energy. After sensing Barago's desperation for power, Messiah reveals herself in a Madō Book that contains forbidden techniques. Though only a shade of her true self, Messiah offers to give Barago the knowledge and power of the forbidden Makai methods in return to bring about the legendary Kiba. Barago wholeheartedly agrees to give up his soul for power and Messiah proceeds to start him on his path of destroying lives to set up the conditions to summon her in her full glory through Kaoru, who is a suitable vessel due to the conditions of her age and birth. But once he fulfills his part in her summoning by removing any trace of humanity in him, upon being awakened Messiah absorbs Barago using Kaoru's body as a medium to use his power to complete the process. Her plans to reach the human world are foiled by Kouga, who enters her realm and defeats her with spiritual help from Kaoru. She is ultimately defeated when, overconfident with her powers, she arrogantly fails to stop Kouga from running his sword into her head after he discards his armor. Shocked at how a normal human has defeated her, Messiah is forced back into her dormant state while releasing Kiba.