Am I The Only One Here?

Melody is a 15 y/o girl living a normal life she lived with her parents and siblings, she went to high school and hung out with her friends, so somewhat normal. She continues to live her life normally as she does every day, but as the days goes on she starts to notice that the more people she knows, the slowly the start to disappear or become distant of her, she doesn't know why and doesn't want to look into it so she just continues her days as they are the same as always. But on April 25 Melody's 16 birthday, she knows that everything was completely different and everyone she knew had suddenly disappeared.