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:
: A tough teenager who joins a group of survivors in Moscow to fight back against an invisible alien invasion. cream in teen vika
: A woman surviving the terror famine and the approaching Eastern Front during WWII, focusing on the will to survive and protecting her family. I could not find a specific "deep story"
: A scientific officer and mathematical wizard who is one of many clones navigating life after being captured by a mysterious alien entity. : A scientific officer and mathematical wizard who
: An impoverished teenager who is suddenly thrust into a world of immense wealth after being mysteriously included in the will of a deceased billionaire .