The title is "You did it! My son"
It is a song of a Father whose son got himself sent to the war (and later the woman voice is supposed to be the son's wife, I guess).
So the story is that his son was called in as a war force for some war at that time (I could check the history and years if I had to and had some time, but since I am rather ignorant around these thing, I just assume it was pre-WWII. I hope someone more educated can add more concrete information here, or you can refer to Wikipedia for the history at that time).
The father, who is a farmer, is proud and honored that his son can be a soldier (but at these time people were obliged to feel honored to be selected as a war force member, so he cannot sound sad or worried, even if he wanted to. This is just a background comment on my part) .
The father says that the son need not worry about the field or the family that he is leaving. That his father and the son's wife can take care of those things, so fight for the nation without worry for home. The total concept of the song is something like that. In your Youtube link there are this lyrics shown in the video, so if you really need word to word translation, It is possible if you know Japanese (if I got time now,but sorry).
Just a quick reply.