Boomerang

In the story a girl had a childhood friend that she used to play with before they moved. After a few years he moves back. He notices her right away but she can't remember him and doesn't remember who he is. He is now watching over her, while she doesn't notice. He has been in love with her since childhood, even if she doesn't remember him.

The girl, has had a crush on her childhood friend which is him, but she can't remember his name or what he looks like. The guy and girl have become friends. Let's see if she can remember him in the end and if they might fall in love again. Love will come back if it's true-- just like a boomerang.