This community loves being toxic so why not reward them with a tasty treat known as Magical Girl Apocalypse? Plot: Kii Kogami hates his normal everyday life and wishes for something to happen. One day in the middle of class, he looks out the window and sees his teacher's head explode when a little girl hits it. He goes to the bathroom to calm himself, but when he gets back to the classroom, he finds most of his classmates were killed by the little girl. YOU SHOULD ALL READ THIS!!! THIS IS THE BOMB!!!!
Sorry I only read yaoi. Deriving from your description, I instantly know that it wouldn't be anything for me.