The renowned "God of Conquest," Keima Katsuragi, is a master at winning over any girl's heart—but only in the realm of dating sim games. His obsession with galge games, which revolve around romancing beautiful girls, has driven him to prefer the two-dimensional world over reality. However, when he accepts a challenge to prove his superiority at dating sim games, he is tricked into teaming up with a mischievous demon named Elucia "Elsie" de Lute Ima. Together, they must track down evil spirits that have escaped from hell and infiltrated the human world, a task that requires Keima to do the one thing he despises most: win over real girls. To make things even more challenging, a deadly collar binds Keima to Elsie, forcing him to conquer the hearts of countless real-life girls to prove his worth as the "God of Conquest."