In the battle of the city of Miya, Sarah and Asham are taken in by the legendary Obermann Brünnhilde. Sarah, who is trying to escape, and Asham, who plans to use Brünnhilde, unexpectedly cooperate. At the same time, Gain and Gaynor revisit their strategy to get Sarah back. Gain and Gainer challenge Brünnhilde based on Gachiko, who can only compete. But at that time, Brünnhilde was already under Asham's control...