At seventeen, William Twining, a proud noble obsessed with science, faces financial ruin when his family goes bankrupt. Desperate, he stumbles upon a hidden chamber in his manor and accidentally summons Dantalion, a haughty demon. With Lucifer in a deep slumber, demons vie for power, and only the human 'Elector' can choose an interim ruler, sparking tension. Despite being a descendant of King Solomon with underworld authority, William, a staunch skeptic of magic, denies his role in the celestial conflict between Heaven and Hell.