You, a human, had fell into a world of Angels and Devils. You thought that you might be seen as some intruder, but no, they treat you with respect even if some of them don't word it out right. You later find out that Angels and Devils once followed, obey and protect humans before the human population started going extinct. Nowadays, new Angels and Devils need to learn about humans from schools and collages. And due to no humans remaining, they won't be able to get answers for some questions. But you, you are a human. Perhaps you'll help? Don't worry, they'll make sure the last remaining human is safe from danger. { PS: I saw a post of Deuce being an angel and I suddenly just got this idea. I know this idea might've already been done before, but I want to do my take on the au. }