One evening while alone at home, Nadia is visited by a mysterious gentleman and a talking cat. This gentleman it turns out is a demon in disguise, who long ago aided her rich family in escaping from Russia over a century ago and has been secretly helping them to prosper in the West. Such a bargain comes with a terrible price, for each firstborn must spend 9 years of service to the demon as a werewolf servant.
Now as the only child of her father's line, it has fallen on her, and the elegant Nadia becomes a brutish, bestial she-wolf.
A little story for this sequence, i have been quite tempted to set this Nadia in the same universe as police wolf Aika. Perhaps she appears at first as an adversary before becoming an ally.