Daremo Shiranai Song...HELP!

[Varg6]

Hey everyone, that movie Daremo Shiranai (Nobody Knows) has an amazing song that randomly plays throughout the movie, its all instrumental (I think by Gontiti, not sure though) and I'd love to know where I could possibly purchase/download it from. Or at least the title of the song, could anyone help me out!?

[Kurumi]

Oooh, that's an awesome movie. I actually would like to know what the title of the song is that plays when they're on the train, I wouldn't have any idea who sings it, but I like the song a lot.