Due to his infection, Messer is relieved from the Delta Flight and reassigned to work as an instructor, but not before showing his gratitude to Kaname. Meanwhile, the Windermereans learn how to use the power of the ruins to their favor and launch an attack on the planet Al Shahal. Walküre and Delta Flight face a tough battle there against the Aerial Knights when Messer returns to assist them. In the occasion, Keith challenges him in order to settle their rivalry once and for all.