Keima Katsuragi's a lover of women -- but not real-world women. Rather, he's a serial seducer of the women he encounters in a peculiar subgenre of video game called "dating sims," where his score is based on how effectively he wins over a woman's heart.
Unfortunately, his controller-mashing ways are about to be upended when a demon named Elsie comes into his life, looking for help with a very thorny problem. Seems a whole slew of rogue spirits have broken out of Hell and are busy lodging themselves in the hearts of girls everywhere ... and the only thing that can shake them free is for the girl to fall in love with someone. Guess who's just been appointed to perform that job, on pain of quite literally losing his head?
It's never easy being the dark horse of the class. Sawako knows all too well what that's like -- she's such a dark horse that the other kids call her "Sadako", after the malevolent ghost in The Ring. So what's a girl to do when she's barely able to say hello -- and then finds herself befriended, almost by accident, by one of the most outgoing and popular boys in her class?
Every year, the 
All Tomoki wanted was a little peace and quiet ... and the occasional glimpse down the necklines of his female classmates (or a peek up their skirts). Then one day, the "Angeloid" named Ikaros quiet literally drops into his life. She can grant any wish, and it isn't long before Tomoki's using her to do everything from sneak into the girl's locker room to you-name-it -- but who is this mysterious creature from the sky, really?