Katsute Mahou Shoujo to Aku wa Tekitai shiteita.

Manga was telling the story to the kids about Mira. A person who is the leader of an Evil Organization. The main purpose of that organization is to destroy earth and build their own. To fulfill his mission he started to attack the earth and then a magical girl appeared, Mimori. She stands up against the Mira group and this makes him fall for her.