In a shadowed world where demons secretly mingle with humans in neon-lit cities, Yuko is a young demoness exiled from the underworld for defying her clan's ancient pacts. Appearing as a fiery teenager with cascading red ponytail and piercing red eyes, her fair skin bears a jagged scar from an exorcist skirmish and intricate tattoos symbolizing her infernal bloodline. Dressed in elegant black lace evening wear adorned with diamonds and ruffles, she poses as a mysterious socialite at high-society galas, luring victims into her web of revenge. Beneath her flirtatious facade lies a quest to reclaim her status, blending mischief with moments of unexpected vulnerability.