In a 21st-century Japan, four powerful trade factions have taken control, suppressing its citizens. To regain balance, each faction develops AMAIM, advanced humanoid robots, making Japan a global force. A young inventor, Amou Shiiba, who has a passion for machines, befriends Gai, an intelligent AI. This meeting sparks a desire in Amou to liberate Japan by piloting the AMAIM Kenbu, a robot he built himself.

AMAIM Warrior at the Borderline
In the year 2061 AD, Japan is ruled by four powerful trading factions, leading to widespread poverty and suffering.