Noah, a temple priest, is tortured by his own brother Ken to purge his "impurity." He flees into the arms of Lucas, a fallen angel and lord of the abyss. Lucas claims him, marks him, refuses to let go. But Noah isn't a lamb—he's a vessel for the Holy Grail, hunted by both heaven and hell. As Ken wages war to reclaim him, Noah must choose: surrender to the abyss that saved him, or become the hunter they never saw coming.
