I remember that, judging from the art, the game was originally a Japanese game. I had it for the PS2, I think it was that was the only system it came out on. The story was split into two parts, in which you played two characters, a boy and a girl (IIRC, they were siblings.) Chronologically, the girl's story came first, but you could play them in either order.
I don't remember a damn thing about this game otherwise, other than that it made no sense at all.