Keima is video gaming's God of Conquest, but isn't as suave in the real world. This becomes problematic when Elsie, an adorable demon from Hell, charges him with helping her retrieve lost souls hiding inside lonely women.

Elsie enrolls in school as Keima's sister and further complicates his life by moving in with him. Keima meets Mio-- the next woman he has to woo.

Keima capitalizes on his knowledge that Mio's situation isn't what it appears to be.

Elsie is impressed that Keima's devotion to fictional girls rivals his devotion to real ones.

Kanon, a pop idol, attends school with Elsie and Keima - though Keima has no idea. His ignorance upsets Kanon, who also happens to be his next target.

Keima and Elsie realize Kanon's disappearing because of the demon inside her. He changes his attitude and begins to help her in earnest.