Leo Shaw finds a key to the Demon Realm, awakening a constitution attractive to female demons, leading him to be recognized as the new Demon King. Female demons like Lyra, Rhea Hawke, and Faye appear. The Celestials also come after him. Leo Shaw unlocks his Demon King's power, seeks his past's truth, shoulders the Demon Realm's burden, and faces the Celestial Realm's army.