In the year 2061, Japan became an occupied territory; Shiiba Amou lives in a dreary world under constant oppression until the day he meets an autonomous AI named Gai; this chance meeting would change his world forever...

Wanted as a terrorist, Amou is now on the run; hungry and tired, Amou finds a vegetable field but is caught trying to steal the old man's crop; his good-natured heart wins the man's trust, and Amou finds a moment of respite.

Just when it looked like the end for Amou and Gashin, a member of the Resistance group called Yatagarasu, saves Amou and takes him to their base camp; Amou is recruited to join them and fight the good fight for Japan's independence.

A mysterious AMAIM attacks Yatagarasu's base camp; Tezuka and Amou team up and barely win the battle, but they are left with a devastating aftermath; afraid of how many more deaths, Amou decides to go his own way.

Amou decides to visit Risa's hometown in hopes that he can return her keepsake to a relative; unfortunately, he learns that her house was torn down and her relatives were chased away by a deputy governor who isn't afraid to abuse his power.

After world tyrants conquer Japan, a young freedom fighter and his mech ignite the flames of rebellion within its oppressed people.