When you are several hundred years old, nothing around you surprises you anymore—you’re tired of it. What is the point of having enormous magical power if you have no equal opponent in the world? There is only one thing left - to look for entertainment, walking through fragile human lives. And when the person at whose expense you want to have fun is only sixteen, the outcome of the fight is predetermined. And the young girl who dreamed of freedom and love receives a slave collar and the opportunity to turn into a cat. It would seem like an easy victory. But your victory can turn into defeat, because even powerful magicians have a heart.