A kid with nothing but wrench skills and stubbornness decides to fight back against four world powers occupying his country. His weapon is a mecha that thinks for itself, which means he's not piloting alone, he's partnering with an AI that questions his choices and forces him to actually earn the fight instead of just winning it. The show understands occupation as a grinding, personal thing: not a backdrop for spectacle, but the reason a mechanic's kid picks up a gun.

Japan in 2061 is split into four regions, each ruled by a rival economic bloc struggling for full control of the country. The Japanese people live oppressed as subjugated citizens, while humanoid weapons called AMAIM stride across the land. Amou Shiiba is a 16-year-old orphan who loves machines and has been secretly restoring an abandoned AMAIM named Kenbu. He crosses paths with Gai, a self-thinking AI that needs battery power, and the two agree to help each other. That choice drags them into a disaster, and Amou is branded a terrorist and driven out of society. Refusing to stand by in the face of injustice, he pilots Kenbu into the fight to free Japan. The show is a sci-fi mecha story about struggle, companionship and a boy whose goal grows from a quiet life to the liberation of his people.