: An impoverished teenager who is suddenly thrust into a world of immense wealth after being mysteriously included in the will of a deceased billionaire .
I could not find a specific "deep story" or book titled Cream starring a "Teen Vika" that matches your description exactly. However, there are several distinct "Vika" characters in media and literature that might be what you're looking for: cream in teen vika
: A tough teenager who joins a group of survivors in Moscow to fight back against an invisible alien invasion. : An impoverished teenager who is suddenly thrust