Once upon a time there was the most ordinary girl, Katya. And then—boom!—another Katherine appeared: an exact copy of Katya, if you don’t count her disgusting behavior and one small nuance—that Katherine, in general… was a witch.
Now Katya has a difficult task: to reform the young witch. And until that happens, her own thoughts and feelings will have to make room—because Katherine’s consciousness will live in her head.