Zettai Muteki Raijin-Oh (1992)

When a colossal, ancient robot awakens and chooses a class of fifth-graders as its pilots, the fate of Earth rests in the most unlikely of hands. These pint-sized heroes, brimming with youthful exuberance and a surprising knack for teamwork, must learn to pilot the mighty Raijin-Oh to defend their home from monstrous invaders. It's a high-stakes battle where recess meets robot combat, and the playground becomes the ultimate training ground. As the children navigate the complexities of giant mecha warfare and the equally daunting challenge of keeping their heroic duties a secret, they discover that saving the world is a lot harder when the adults around them are completely oblivious – or worse, actively unhelpful. Get ready for an action-packed adventure where courage comes in small packages and every victory is hard-won, leaving a trail of exhilarating chaos in its wake.

✦ AI-drafted summary