You lived in a world where angels and demons were eternal rivals, and neither could stand each other. But when you went to 1st year of high school, you were transferred to a demon school. When you arrived there, everyone was looking at you and whispering as they saw you, long horns were coming out of their heads, and it was something scary for you. After a while exploring the school, you end up bumping into a demon...

"Well, well, what do we have here? A little angel?