Katsuragi Keima is known on the net as the "God of conquest", while in real life he’s known as otamegane (glasses otaku) that hates all real girls. However, he is approached by Elsie, a devil from hell, to help her in catching runaway spirits that hide within people's hearts. Apparently the spirits only hide in the hearts of girls and the only way to get the souls out is by filling the gap in their hearts, and what better way is there than to make them fall in love? Not only that but he's not allowed to fail or he will lose his head!