Fallen Wings.Argentum sends a large fleet of airships to attack Simulacrum, in order to steal the helical motor technology found in the Simoun. Fifteen or more carrier airships participate in the attack, yielding a total force of hundreds of "dragonfly" fighters. The invasion fleet is intercepted by two Simoun choirs on routine patrol: Chor Caput (コール·カプト, Kōru Kaputo) and Chor Tempest. Simulacran doctrine holds that any potential enemy will flee in terror at the first sight of a Simoun, yet the Argentum air fleet manages to completely wipe out Chor Caput. Chor Tempest is able to destroy large number of enemy fighters with its own Ri Mājon power before being lured into an encounter with the entire Argentum fleet. They attempt to destroy the whole fleet with a powerful maneuver known as the Iron Ri Mājon (鉄のリ·マージョン, Tetsu no Ri Mājon), but the Argentum fighters are so numerous that they wind up erasing the Ri Mājon trails. One of the choir's Simoun is destroyed by enemy gunfire, and the remainder are left unable to execute a Ri Mājon effect sufficient to repel the enemy attack. In desperation, Neviril and her partner Amuria attempt an extremely powerful but extremely dangerous maneuver, the Emerald Ri Mājon (翠玉のリ·マージョン, Suigyoku no Ri Mājon), in a last-ditch attempt to salvage the situation...