Known as the 'God of Conquest' in the online realm, high school student Keima Katsuragi excels at winning over virtual girls in dating sims. Dismissing real-life interactions as a tiresome game, he inadvertently agrees to a challenge urging him to conquer a girl. This leads to the arrival of Elucia 'Elsie' de Lute Ima, a demon tasked with capturing wayward spirits in girls' hearts. Facing a life-threatening contract, Keima must now apply his gaming prowess to win over real girls and fulfill his mission.