Itazurakko Yo ni Habakarazu!!

Synopsis

In order to plunge the human world into a spiral of chaos, the demon girl Leopold has descended on earth. The one she chooses as her first target is a high school girl who seems 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 a demon's worst enemy... (Source: Square Enix, translated)