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...

After meeting the survivors of the icy apocalypse who are holed up in Mishima Mall, Tetsuo makes a few attempts at making friends. His defeat of the kaiju that attacked the mall has made him a hero to the inhabitants, but before he can establish any firm relationships, a new threat appears. Another band of human survivors, led by the mysterious Colonel, wants to seize control of the mall-and they have their own kaiju to do it with!