Keima Katsuragi, a second year high school pupil, is an enthusiastic player of gal games (video games that require interactions with anime-styled pretty girls). Yet, in his school life that was real, Keima is called a derogatory portmanteau of the two words megane and otaku, otamega.
At the start of show, Keima receives an e-mail offering him a contract to “conquer” girls and, believing it’s an invitation into a game challenge, he takes. In response, a cunning devil from Hell named Elsie appears: a Spirit Hunter.