Kami nomi zo Shiru Sekai The World God Only Knows
Katsuragi Keima, a second-year high school student, is an avid dating sim gamer. He is known on the Internet as The Capturing God for his legendary skills to be able to capture any 2D girl in games. However, in his actual school life, Keima is known as otamegane.
Keima receives an e-mail offering him a contract to capture girls. He accepts what is thought to be a challenge, and a demon from Hell nicknamed Elsee appears. She asks for his cooperation to help her in catching the runaway spirits. These spirits hide themselves inside the girls' heart, and Elsee suggests that the only method to force the spirits out is by capturing their hearts — making them fall in love. Appalled by the idea, Keima refuses after clarifying to Elsee that he is only interested in capturing 2D girls and that he detests reality. Nevertheless, with the contract already accepted, Keima will have to help Elsee no matter what; if they fail, both Elsee and Keima will lose their heads.