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, a boy barely old enough to go to school. Ten years later, the massive alien swarm closed in on humanity’s homeworld and Tetsuo and the Earth defense force deployed for the final battle with the invading horde. They lost…

Upon his return to Earth, Tetsuo finds the planet frozen over. Much to his surprise and horror, he discovers that the alien kaiju have made it to Earth too. But after meeting a hardy band of human survivors, Tetsuo learns that Yukio has survived as well, his consciousness downloaded into the escape pod—which also happens to be a battle robot! Now headed for the survivors’ stronghold, Tetsuo is determined to make new friends. But the people Tetsuo has found are not the only ones left, and a mysterious humanoid kaiju also lurks among the ruins.