I remember what it was about but I can`t remember the name of it. I will try to explain it the best I can.
The movie starts out with a little girl who finds a boy in a forest. She got lost and the boy tries to help her find her way out. But she cannot touch him because if she does he will disappear. There was this scene where we used a stick instead of holding her hand. Then the movie moves on and she grows up only to find the boy again. She falls in love with him. She then learns about him and he tells her he was abandoned as a baby and these yoki found him. They give him a ketsu mask to hide his face. Unfortunately in the end of the movie the boy tries to save this kid and he ends up touching him. And he disappears.

That`s all I remember about it.

The name is Hotarubi no Mori e