Hiroyuki Masaomi is what they call a Chuunibyou: a teenage young man with eighth grade delusions of anime and manga, thinking himself as the reincarnation of the great demon lord Kairser Leviticus Babylon IV. His classmate Alice Berith, being a true devil herself, thinks nothing of him but an abnoxious idiot, constantly arguing with him on the daily basis. And thus begins the bizzare adventures of the couple devil/human, with her trying to destroy him, while he uses his chuuni abilities to avoid her attacks and gain more and more allies of the supernatural...