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Kami nomi zo Shiru Sekai (神のみぞ知るセカイ, lit. The World God Only Knows?), abbreviated as Kami nomi (神のみ?), is a Japanese manga series written and illustrated by Tamiki Wakaki. The manga has been serialized in the Weekly Shōnen Sunday magazine by Shogakukan since April 9, 2008, with individual chapters collected in six tankōbon volumes as of October 16, 2009. The prototype version of the story was first featured as a one-shot in the Weekly Shōnen Sunday magazine on its 2007 Issue 32 release, and was titled "Koishite!? Kami-sama!!" (恋して!? 神様?). As of December 16, 2009 (2009 -12-16), 79 chapters have been released in Japan.

Keima Katsuragi, 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 (オタメガネ), a derogatory portmanteau of the two words otaku (オタク) and megane (メガネ-"glasses").

At the start of the series, 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 hearts of girls, and Elsee suggests that the only method to force the spirits out is by "capturing" their hearts—making them fall in love with Keima. 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 would have to help Elsee no matter what; if they fail, both Elsee and Keima would lose their heads.