The Demon King Of The Boiling Isles

[Years after both series ended] The Boiling Isle civilians discover that they were sealed away from the rest of the Netherworld until now. Luz must endure the Collector's curse following their defeat. Demons are disappearing on the Boiling Isles. Amity struggles with a question. A teenage King, void of ambitions, finds himself connected... to Iruma and Ameri's unborn child.