Responses
If you're looking for a manga, that kinda sounds like Vampire Knight, but I could be wrong.
Maybe Noblesse? It's so vague
Yeah sorry. I couldn’t remember. Just that nobody knows that the school becomes filled will monsters going to school at night.
I have a question
It’s been bothering me for a while. The image(maybe even memory) at night the school becomes something else. The principal/headmaster makes sure all day time students are out before a certain time. The school locks down. Sorry it’s bothering me cause it repeats just that and I can’t remember if a mange or not