Heard of the anime Bokurano?
Directed by Hiroyuki Morita (The Cat Returns) and produced by Gonzo, the anime aired in 2007 in Japan and is based on the manga series Bokurano: Ours.
But it isn’t a direct adaption of the manga, as Hiroyuki did make changes for the anime series.
So what is the anime about? well it’s a science fiction one about a group of middle-school students who unwillingly assume the task of piloting a giant mecha named Zearth in a series of battles against mechas from parallel worlds. And, yeah there are massive things at stake, i’m talking the survival of Earth so they have to keep winning each battle.
Here’s the trailer, all subbed with english subtitles: