Mazinkaiser SKL

Before the story begins, three factions-the Garan Army, the Kiba Army, and the Aira Army-are locked in a relentless war for control of Machine Island. The island is essentially a prison, cut off from the outside world, but it holds immense resources that let each faction build an endless supply of giant robots for their armies. When the world government discovers the island's power reactor is unstable and will explode in 66 hours-wiping out all life on Earth-they dispatch the mercenary duo Ken Kaido and Ryo Magami, along with their giant robot Mazinkaiser, to stop the disaster. But whether that was the right call remains to be seen.