Keima Katsuragi, an enthusiastic galge player known at his school as "Otamega" (a pejorative name combining the terms Otaku and Megane) and online as "The Capturing God," receives an e-mail one day offering him a contract to "catch" ladies. He takes it as a challenge, and Elsee, a demon from Hell, arrives. She requests his assistance in catching wayward spirits that had taken up residence in "actual" girls. He refuses, claiming that he only likes the game's girls, and she threatens to cut off both of their heads if he refuses.