Ведьма, тень и черный кот

What can change in the life of a witch with the appearance of an ordinary black cat? And what if the cat is not ordinary, but completely hairless? And what if it's not quite a cat? However, they say that a cat in the house brings happiness. And for your happiness, as is known, you have to fight. And even if this means I have to meet a living shadow, free a necromancer, and battle a demon, so be it. Then what about the cat…? That’s where this whole story began.