After the war with the Principality of Amidonia comes to a close, provisional king Souma receives an unexpected message. It's a request for annexation from his former enemies in the Principality. Facing a civil war and an invasion by other countries, the Principality now needs the Elfrieden Kingdom's strength in order to fight back. Souma agrees to the annexation and summons those who play an important role in the defense of the Principality to Van for an awards ceremony, but the Princess of the Principality, Roroa, is hiding in with the mountain of gifts they give him?!