Jadou is the disowned demon son of Demon Lord Janus, ruler of the fantasy realm Neverland. Raised with genuine love by his mother, he faced only harsh prejudice from humans who saw him solely as a monster, an experience that forged him into a killer. He burns with hatred for humanity, driven by the ambition to become the Demon King and destroy the world, finding pleasure in others' despair. As the key instigator of the continent-wide First Neverland War, he summons a teenage girl, Little Snow, from Earth to Neverland through an isekai-like event. She becomes his loyal ally and magic user, embracing Neverland as her home and developing strong feelings for him, choosing to stand by him even in death so neither faces the afterlife alone. His actions directly shape the war's course, culminating in a pivotal battle against his half-sister Hiro, the inheritor of Janus' legacy, where a narrative divergence explores a "what if" scenario of Hiro sparing him, though the canonical outcome remains ambiguous. Jadou possesses distinct demonic traits including pointy ears and piercings.