This is for a friend. Please help.

An anime and/or manga about:

There's a high school where all angels and demons and magical people attend and only one human boy there, when an angel comes down from heaven to hunt down troublemaking demons. The rest of the school tells the human boy to go up to her and talk to her, so he does, and she freaks out on him basically going "ARE YOU TRYING TO KILL ME?!" or something along those lines.

"We are what we believe we are."
C. S. Lewis

This anime has been found. It was Date Alive. Thanks for any possible help you were going to give 🙂

"We are what we believe we are."
C. S. Lewis