Garo: Makai Senki

As long as humans have evil spirits, the demon beast horror will appear from the demon world. To eat the body and soul through the shadow. However, there is light where there is darkness. The Makai Knight and Makai Houshi are fighting somewhere tonight as guardians. Immediately after the seal of Horror Cigarain, Saezima Kouga, who holds the title of Garo, the highest rank of the Makai Knight, is attacked by a man with a red mask, and his chest is stamped with ruin. Koga endures the pain and continues to subdue the horror while hiding the existence of the engraving. What is the identity and purpose.