A hybrid born between an angel and a devil, the Grand Hybrid with the highest lineage among them is said to possess the power to blow up the universe the moment it awakens, a legendary being known as the "Sagikae." Unlike 'Jaeik,' who aimed for a simple and ordinary life, the winds of fate bring the ultimate Sagikae, born of angels and demons, to unfold a strategy to make him join their side. Will Jaeik awaken as an angel or a devil?