Toaru Hikuushi e no Koiuta

Synopsis

The council, along with the Levamme representatives, begin to learn more about their world. Their world is made up of three layers, with waterfalls separating each layer much like a staircase, and their world is supported by bedrock. At the end of their world is the End of the Sky, which allows for water to be reabsorbed back into the Holy Spring. The fleet is also able to pass through the End of the Sky and reappear at the other side, much to their amazement. Luis calls in Kal-El, and Admiral Merze is shocked to learn that Kal-El is actually Karl, the former crown prince. As they return home, Luis gives a speech detailing their adventure to a stunned populace back home. Karl is presented to the crowd, much to their disbelief as he is thought to have been dead this entire time. In his speech, he details his adventure and vows to retrieve Nina back from Sky Clan and force relations with them, and proclaims his love for her, much to the crowd's delight. This is all revealed to be a plot by the Foreign Secretary, Amelia, who sees this as a way to gain support using romantic drama to achieve their goals of getting Nina back. The students embrace and celebrate their graduation. Some time passes, and everyone has moved on with their lives. Karl is now a real military pilot and is ready to begin his mission to retrieve Nina back. As he leaves, Ariel punches him one more time, but it is clear that she is uncertain about her feelings for her adopted brother. The combined fleet once again approaches Sky Clan, and it's clear Sky Clan is waiting, and they prepare to do battle once more over the skies.

(Source: Wikipedia)