This is a prologue that understands what you came for: Elsie being Elsie before the chaos of the main series, all deadpan delivery and demon-hunting incompetence. It costs almost nothing to watch and gives you exactly what existing fans need to know. A character introduction that doesn't pretend to be more than it is.
Elsie's assignment comes straight from hell's bureaucracy: track down and recapture the malevolent spirits currently loose on Earth. Her supervisor, the no-nonsense Docrow Skull, makes it clear this isn't optional. What should be a straightforward supernatural retrieval mission becomes anything but when Elsie realizes the escaped spirits are causing problems far more complicated than she anticipated. Her methods clash with what actually works in the real world, and she needs help from someone who understands how humans tick. The OVA sets the stage for the larger conflict to come, establishing why this demon girl ends up working with a high schooler who knows nothing about her true nature. Comedy erupts from the gap between Elsie's infernal perspective and the mundane reality of modern Earth, where capturing demons proves far messier than any official handbook suggests. This prologue lays the groundwork for understanding how supernatural chaos becomes entangled with very human problems, all while maintaining a lighthearted touch that balances absurdity with genuine stakes.