After the escort of Kudelia Bernstein led to a series of deadly battles, the Tekkadan organization began to rise, with Mikazuki Augus taking part. While many lives were lost, the conflict exposed the corruption of Gjallarhorn, helping the world change slowly but surely. But as Tekkadan gained the rights to halfmetal, they began to attract attention from a new enemy.
Admoss Company, newly founded by Kudelia, begins to inspect a mining site filled with halfmetal under the protection of Tekkadan. However, the leader, Orga Itsuka, believes that an attack is coming and sends Mikazuki in the mobile suit Gundam Barbatos Lupus to face the enemy!