Easily a top-50 best anime series of all time in anybody’s list. There are two short seasons, it is beautifully produced, and the English dub is well worth your time.
The kids are literally farmed in a hyper cube. Many many parallels to what truthers say is going on. Much like how the humans in the newest Planet of the Apes trilogy are the Archons, and the apes are actually the humans. Watch this with eyes to see and you’ll be blown away.