Itazurakko You ni Habakarazu!!

Itazurakko You ni Habakarazu!! summary: In order to plunge the human world into a spiral of chaos, the demon girl Leopold descended on earth. The one she choose as her first target was a high school girl who seemed a bit dull. Her attack is a success, and Leopold laughs loudly. However, what Leo doesn't yet know is that this high school girl is the worst enemy of a demon...