The choir did a few more performances, with all of the Japanese were captivated by. In time, MacArthur makes big moves in the war and the Japanese move all the women by train to a much more remote camp. There is less food and many women feel more despondent. A number of women die as they have given up hope. And then one day, the top Japanese man comes into this new camp and tells the women that the war is over. He adds that he did his best to treat the women well but knew it was not enough. (I was not sure if he really believed this, or if he was just trying to save face.) The women are exuberant. I believe that's where the movie ends.
He was obviously just saving face. He couldn't even admit that the Japanese had lost the war (spoiler).