Once in hell, Mr. Lucifer became angry with his servant - Monael (Uchiha Sasuke), and decided that it would not hurt him to stay on earth for a while. Turning into a cat, Monael rises to the ground. At the same time, a slightly unusual girl, Haruno Sakura, leads her daily life - school, scandals with parents, conflicts with teachers and classmates... but one day everything will change dramatically when she meets the most ordinary, unremarkable at first glance black cat...