Naze announces to McMurdo that the Turbines will disband, provided McMurdo takes in the female members. With no one left to trust, Tekkadan sever their ties with the Admoss Company to take part in the revolution led by McGillis. Ride assassinates Nobliss and all his cohorts to avenge Orga, while Kudelia visits Atra and Akatsuki - the late Mikazuki's son by Atra - at Sakura's farm, fulfilling her promise to look after them. Mikazuki, who finds himself outmatched by Ein, pushes Barbatos to its limits to win. Both reminisce on and express their regret over the tragic ends of McGillis and Tekkadan, though resolve to keep moving forward. Mikazuki arrives in the Barbatos Lupus to save Ride from the Pluma swarm before setting his sights on the Mobile Armor.
After revealing himself under the mask, McGillis tells Orga and his team his plans to reform the corrupt Gjallarhorn. With only a few hours left before the election, Orga plans one final, but highly risky, operation to get Kudelia and Makanai into the city, where parliamentary elections are about to begin. Meanwhile, Coral orders Crank to return to the battlefield to erase any evidence of their defeat before the Gjallarhorn inspectors from Earth find out. Furthermore, they are given an offer to accompany Makanai to a parliamentary general session in Edmonton in exchange for safe passage. With the help of members of a local news network, Orga and his team re-establish communication with the Isaribi while Mikazuki flies out to space to once again pilot the Gundam Barbatos and engage the Gjallarhorn forces in the conflict.
While McMurdo declines to break the cup due to his investments on Mars, he warns Orga that any betrayal of Teiwaz would lead to severe consequences for Tekkadan. As a show of trust, Orga gives McMurdo his sakazuki cup to break, should Tekkadan be considered a hindrance to Teiwaz. A series of vague posts made by animators on the original series piqued interest last year, and Sunrise has now confirmed suspicions with its big spin-off announcement. Meanwhile, Kudelia and Fumitan meet a masked man who reveals the true motives of those backing their trip to the Dort Colonies. To Orga's horror, Rustal refuses because he wishes Tekkadan to be made a scapegoat and slaughtered by the Arianrhod fleet, in order to restore both faith in Gjallarhorn and peace in the Earth sphere. McGillis tells him to stop the excavation immediately, revealing what they discovered is an ancient Mobile Armor; a forbidden piece of technology that caused both the Calamity War and the mass casualties associated with the conflict. The official Mobile Suit Gundam Iron-Blooded Orphans Twitter account has released another new illustration of a mobile suit that appears in the spin-off, Mobile Suit Gundam Iron-Blooded Orphans: Urðr Hunt.
Humiliated by McGillis, feeling betrayed by Rustal's refusal to defend him and obsessed with his honor and his men's sacrifice, Iok orders his servants to contact Jasley. Meanwhile, the Hotarubi and Gundam Flaruos is severely damaged and Shino is injured by the Dáinsleif squadron's second barrage. McGillis reveals that the Hashmal destroyed the nearby fuel depot and Gjallarhorn's third ground base to resupply, as the Plumas that accompany the Mobile Armor are not equipped with Ahab Reactors, warning that the Hashmal spawns multiple Plumas to refuel and repair it. With Tekkadan's arrival, a ceasefire is declared while the situation is assessed. The Hashmal breaks through Tekkadan's defenses in the gorge while Julieta prevents Iok from attacking it once more, as his heavily damaged Reginlaze will only be a distraction. While he looks tough, and will act severely when needed to, he ultimately ends up pampering Wistario in many cases.
Mikazuki overclocks Barbatos as he had against the Graze Ein and Hashmal, decimating the Gjallarhorn soldiers until Julieta intervenes. However, there are many who do not look favorably about the rise of the youngsters who are trying to start something new. Upon his arrival on Mars, McGillis reveals to Tekkadan that Mobile Armors are fully automated, therefore making them capable of unrestrained violence, and that Mobile Suits - especially the Gundams - were created to destroy them. Later, Eugene and Akihiro corner Radiche, demanding Galan's whereabouts. Following the incident, Orga and McGillis promise to help each other take down Iok and Jasley to achieve their long-term goals. This leads to a standoff between Tekkadan and the Outer Earth Orbit Regulatory Joint fleet which has descended to the surface.
To ease tensions, Naze is forced to swear on his life that he will keep Tekkadan in check. Such brutal actions sadden Kudelia, as she hoped to build a world free of bloodshed for them but is making minimal progress. News of Tekkadan's exploits has also reached the ears of Wistario Afam, a youth born and raised at the Radonitsa Colony near Venus. Meanwhile, the Isaribi is assigned a liaison from Teiwaz to oversee the vessel's activities during the long journey to Earth. Cornall Kosa A mysterious girl who appeared before Wistario, saying that she was the guide to Urðr Hunt. Meanwhile, Naze brings up McGillis' proposal of giving Tekkadan full authority of Mars to Teiwaz, which raises concerns and arguments from McMurdo and Jasley respectively.
During a team meeting held by Orga, Zack quits the organization in fear of his life. McGillis then confesses that the reason he betrayed Gaelio and Carta was due to their friendship with him causing his drive for power to waver, while his ambitions of reforming Gjallarhorn were because he promised Almiria a safer world. Refusing his order, Tekkadan battles Teiwaz in Mobile Suit combat, but unaware to them, the Mobile Suit battle is a distraction for several Tekkadan troops led by Orga to infiltrate and hold the Teiwaz members as hostages. That resulted in abundant funds and more people interested in joining, growing massively to even have a branch on Earth. Upon receiving word that his elder brother Savarin has committed suicide for his actions that resulted in a Dort 3 massacre, Biscuit contemplates on leaving Tekkadan.
Tekkadan returns to Mars, while Kudelia remains to advise Makanai and see her vision come to pass. Upon their arrival at Admoss Company, Orga discovers that Gjallarhorn manipulated the media to make the public think Tekkadan ignored orders to surrender. Akihiro's unit scrambles to defend the plant, but the Hashmal wipes out a portion of the plant with its beam cannon. Makanai agrees to help Tekkadan with their new identities, but they must return to Earth to finalize the process. Meanwhile, Carta continues her mission to intercept Tekkadan against Iznario Fareed's orders.
Thanks to Mars winning the race to terraform the planets against Venus, Venus remains ignored by the four major economies. Orga plans for his comrades to escape to Chryse through a series of Calamity War era tunnels while McGillis creates a diversion by penetrating through Gjallarhorn's front lines and Orga escorts Kudelia and Atra back to Admoss Company. After being severely disciplined by Haeda for luring Gjallarhorn's forces toward the retreating First Corps during the battle, Orga proposes to his comrades in the Third Corps to rebel against their elders. The conflict exposed the corruption of Gjallarhorn as well, and the world was changing slowly but surely. It turns out Urs Hunt is set in the year P. As the series comes to a close, Kudelia silently monologues that while Mikazuki and Tekkadan are gone, she could still love the world that they sacrificed their lives to change.