Katsuragi Keima, a high school sophomore in class 2-B of Majima Academy, is a dating sim master and known as the "God of Conquest." Elsie, a demon descended from Hell, comes to speak to Keima for entering into a deal with the devil. In order to protect his life, he must capture the "Loose Souls" which exist in people's hearts. To do this, he must make real-life girls fall in love with him! A loose soul escapes into his classmate, track-and-field athlete Takahara Ayumi's heart. Will he really get her to fall in love with him?!
When the buddy dies,
the demon also loses her head.
Cuando el colega muere, el demonio 
también pierde la cabeza.
Cuando el colega muere, el demonio 
también pierde la cabeza.
Quando o parceiro morre, o demônio
 também perde a cabeça.