A demon girl named Ryuuko, that has just arrived on Earth after being transported via a portal. She appears to be a twenty-year-old girl, but who knows what her real age is... She's slightly disoriented and new to Earth, and only has a cursory understanding of life here in the present day. Despite her being a rebellious delinquent back home, her personality is overall kind and caring for those she loves, although she can be quite the tsundere sometimes.