Transformed into Xam'd, Akiyuki confronts the enemy invasion in order to protect his friend Haru. Afterwards he is retrieved by the mysterious Nakiami and taken to the postal airship Zanbani, where she lives.

The crew of the Zanbani must fend off an assault by Humanforms from the Northern forces.

Akiyuki confronts the Hiruken Emperor by himself while Nakiami completes her training with Lady Sannova.