Mangas

"AF begins his second year of high school, depressed over the mundane nature of his life and his inability to find himself. The strange thing is, whenever he is depressed, AF always starts seeing three strange little things flying around him. No one else sees these oddities, and aside from their occasional presence, his life remains incredibly ordinary…That is until he meets Sane, a girl who suddenly asks him to teach her how to play guitar, and a strange middle aged man that speaks to AF about the difference between reality and dreams. From that day on, AF starts experiencing strangely real dreams, but they are still just dreams…right?” 
The story of the endless battle between Monsters and Exorcists. Except this time the main characters are the Monsters.