Young mecha pilot Tetsuo survives the last great battle against an alien horde. His escape pod lands on Earth eight years later, but his homecoming is not what he expected! In the year 2025, huge beasts from beyond the galaxy attacked Earth. In the war that followed, humanity fought back with a giant robot named Yukio, piloted by Tetsuo Yabusame, As the massive alien swarm closed in on humanity's homeworld, Tetsuo and the Earth Defense Force deployed for the final battle with the invading horde. They lost... The vast power source found within Yukio's final form gives humanity a glimmer of hope toward securing Earth's safety. But on their way to a new village, Tetsuo and Yukio encounter a giant robot. What's more, this robot looks exactly like Yukio, but with black hardware! Will this unknown machine prove to be friend or foe? Then, Earth's icy battle heats up as one of the strongest kaiju smashes its way toward Tetsuo's crew from belowground!