Kurono Maou is an attentive guy who studies well and feels discomfort from his facial expression. He is happy of having nice friends, though his heart is still single. One day Kurono felt sick at the lesson while listening to a literature lecture. A strange headache made him wish to visit a doctor, however, the guy felt dizzy and fainted. When he woke up, he noticed magical things consisted of beasts and witchcraft. Kurono realised he was in a different universe.