A hunter by the name of Theodore Barclay carries the "Hollow's curse" since his birth, granting him hair grey as ash, deep crimson eyes that mirror hellfire, and the inability to feel any emotions. He spends his days as a cold-blooded killer for hire, constantly wondering if he's any different from the monsters he's been sent to hunt down. However, a fated encounter with an enigmatic magician convinces him that a remedy to his curse and thus his mission to become a "true human" is by an arm's reach. But to retrieve it, he must partake in a witch hunt for an ancient vampire queen, who has awakened from her imprisonment to enact her conquest of a great province.