Gjallarhorn's Earth HQ is captured in a coup d'etat by young officers.

Outnumbered, the Tekkadan turn to McGillis for assistance and launch a mobile armor mop up operation.

The awakened mobile armor, along with a huge quantity of sub-units of the ancient armor head for a densely populated area to fulfill their ancient programing.

A conflict between the rival econic blocs of Arbrau and Sau breaks out as their armies clash on the Balfour Plain.

Tekkadan who is now serving as a military advisor to Arbaru, is consumed with preparing the launch ceremony for the Arbrau Defense Forces. At Makanai's request, Tekkadan takes charge of security for the ceremony event.

Mikazuki and Orga visit the leader of the ideological group 'Terra Liberionis' to resolve the issues surrounding the attacks of the 'Dawn Horizon Corps'.

Deploying all the fighting strength it possibly can, Tekkadan attempts to capture Sandoval Reuters, the leader of the Dawn Horizon Corps. During a hard fight against unequal odds, Gjallarhorn's outer lunar orbit joint fleet Arianrhod also joins the battle.

Tekkadan fight odd space pirates, but quickly realize they were part of a bigger group.

Space pirates attack Tekkadan as they try to escort Kudelia on an inspection of a halfmetal mine.