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. However, 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, Gashin, a member of the Resistance group called Yatagarasu, saves Amou and takes him to their base camp. There, 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 must face if he joins them, he chooses 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.

To bring their AMAIMs into a minimally operational state, Amou and Gashin visit a nearby city to receive substitute parts from Yatagarasu's helper. Unfortunately, they get caught up in a territorial dispute between the Oceanian and Asian military...