Michael, the Gatekeeper of the Ruins, bears an immortal physique and unparalleled mastery over holy light, yet he is branded a heretic and relentlessly hunted. When he teetered on the verge of death, Ruth, the little black cat clutched in his arms, suddenly awakened. She morphed into an enchanting shadow guardian and fended off their powerful assailants in the blink of an eye. From that moment onward, the man and the beast sealed a blood pact, setting off on a path of flight and vengeance.