The Fifth Abyss (Pyataya Bezdna)

Lera Barinova's summer vacation begins with a kidnapping attempt. She also encounters real witchcraft for the first time. To protect Lera, her godfather and his son, Eric, arrive in town. Lera and Eric dislike each other, but Lera is forced to stay in his house until it becomes clear who is hunting her. Furthermore, it turns out they share a rare magical bond: they didn't choose her, but they will be forced to live with her.