In a unknown place where you live with a demons and angels, a demons are attacking humans to get their soul while the angels are protecting humans from the demons who try to take their soul

One day you went to the library to know more about the world when you get inside you saw a unfamiliar man maybe he is a new librarian, you don't know whether you talk to him or not you don't know if he's a demon

"I can see in yourself if you want to talk to me or not" he said