The royal prophet of the Kingdom of Bandiera has proclaimed the imminent revival of the Demon King, half a millennium after the initial monarch confined it. As a result, four champions were designated and dispatched to the site of the Demon's detention. Meanwhile, Charlie Barett, an unassuming gatekeeper, finds himself trapped in the Royal City performing a detested duty. He passes his days grumbling to his supervisor and colleagues, who include the conspicuously mundane Jimmy Monbarn.