Looking for a story

Looking for a story that I read a few years ago. A pilot, I believe military, undergoes a swap (as part of a global swap) and ends up in the body of a little girl I think in Japan. I remember that she gets attacked by a man early on and escapes. She's taken in by a family. If I remember right, eventually she is reunited with his family. I've searched all the key words I can think of but can't find it. Can anyone help?