Akiyuki receives Haru's letters and after learning that she will be waiting for him at Tsumebara Pass, he leaves with Roppa to meet her. However, he encounters more people turning into humanforms along the way.

Akiyuki loses his sense of self, and with his Xam'd mask permanently affixed, he is captured by a slave trader. Meanwhile, Nakiami continues her journey and meets Yango, a young boy who also became a Xam'd.

Ryuuzou and Haru's father set off to rescue Midori from the East Autonomy Military Facility. Akiyuki and Haru venture further into the Quickening Chamber.

The Hiruken Emperor is free. Haru, Nakiami and Akiyuki encounter Midori transformed and join forces to stop her.