Macross 7
Summary
[From Manga-Sketchbook]:
In the year 2045 A.D. the 37th Long Range Emigration Fleet - MACROSS 7 - proceeds on its mission to the center of the milky way. The headquarters of the Fleet are located on the 7th battleship 'MACROSS' class . Along the way the Fleet encounters of the Barauta. And then in the following year, 2046 A.D. In a sector of the combat zone the story begins..
Note: This series is very different from the rest of the Macross series. Its plot is not focused on space combat; in fact mechas don't appear in the story at all. Instead the story revolves around a sport called "air blading" (it's pretty similar to the Airgear manga), using the Macross universe as a context.
In a system like that there would need to be rigorous documentation and certificates of prior ownership/guardianship or else anyone and everyone would just get grabbed off the street and enslaved at any time, and such a society would collapse instantly. So these slavers wouldn't have such documentation unless it was a forgery since the kids were just kidnapped; both offenses should be very serious capitol crimes. Once again, the day is saved by glorious Bureaucracy! (and the MC's knowledge and exploitation there of).