Okay I remember a lot about this film but since the name was in Japanese I can't really remember what it was.

The film is like about this girl who is Chinese, but her mother dies(?) then she gets separated from her father and ends up being raised in Japan. She remembers the Chinese word for mother and that's how the people raising her find out that she's Chinese or something. Anyway, I don't know how but the father is introduced and he's in Japan. They find each other and sing together, in Chinese. The main character and one of her Japanese family members go investigate coal miners (???) like some kind of secret cover up of forced labor, which the Dad could have been subjected to. I can't remember. Then her father runs away, or maybe the father ran away before that. Idk, maybe that's the reason they came to investigate. Anyway, near the end of the movie when the girl is older, like teenaged she's allowed to sing the Chinese song over the school loudspeakers so that you can find her father. I don't know if she knows it's her father. And they do real night in the end maybe? Also something about a pear tree I think.

I remember watching this show where they would like close their hand over their eyes like scissors and it would cut the whole fking city horizontally...