This prequel OVA shows Keima Katsuragi before his demon contract. A high-school gamer so devoted to dating-sim heroines that he is known online as the God of Conquest, he ignores real girls entirely. In Hell, the demon Elsie de Lute Irma is assigned to hunt runaway spirits hiding in human hearts, and she is told that this gamer is the one who can drive them out. That recruitment launches the main series.