Episode 15

The Trial of Footprints (足跡のゆくえ Ashiato no Yukue) is the fifthteenth episode of Mobile Suit Gundam: Iron-Blooded Orphans.

Biscuit reunites with his elder brother Savarin, but he and Atra are quickly nabbed by Gjallarhorn forces while Atra fakes her identity as Kudelia. As Atra is being beaten by her interrogators, Mikazuki, Orga, and the rest of Tekkadan race to rescue them. Meanwhile, Kudelia and Fumitan meet a masked man who reveals the true motives of those backing their trip to the Dort Colonies.

Summary
While Fumitan watches over Kudelia's shopping with Mikazuki on Dort 3, Nobliss Gordon becomes annoyed with Fumitan for not following orders.

Orga and company meet Novona Mingo, leader of the Dort Union workers. He takes them to his home in the slums of Dort 2, where all the colony workers live in poor conditions. Atra and Biscuit also meet up with Biscuit's brother, Savarin, but he turns them over to Gjallahorn believing that Atra is Kudelia Aina Bernstein. Biscuit tries to reason with Savarin, but the latter informs Biscuit about the weapons Tekkadan brought into the colony. Savarin is trying to stop the colony rebellion all together to spare the lives of the Dort union workers.

Orga learns of their capture and sends Mikazuki out to find them. Kudelia and Fumitan hide out and wait to be picked up. Gjallarhorn brutally interrogates Atra, but she refuses to talk. Meanwhile, Biscuit argues with his brother. He reveals to Savarin that Atra is not Kudelia, but Savarin wants Gjallarhorn to believe it's her anyway to avoid the Rebellion.

Kudelia tries to turn herself to free Atra but Fumitan stops her and they are confronted by a masked man calling himself Montag. Montag reveals that Nobliss Gordon had Tekkadan deliver the weapons to the union workers, and even hired Fumitan to spy on Kudelia. Kudelia refuses Montag's words, but Fumitan confirms them and leaves, causing Kudelia to chase after her. Later, Mikazuki frees Atra and Biscuit. They are caught by Savarin, but leave with Orga and the others after Biscuit bids a final farewell to his brother.

Credits

 * Screenplay: Hajime Kamoshida
 * Storyboard: Iwao Teraoka
 * Director: Shoji Ikeno
 * Character animation director: Kenichi Onuki, Daikago Noriyuki Hitoshi
 * Mecha animation director: Kunihiro Abe