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The Deucalion receives new orders, but Capt. Magbaredge senses that another mission is in motion behind the scenes. Inaho takes action to protect Princess Asseylum. Elsewhere, Slaine explains his intentions to Princess Lemrina. He does not know that the situation is changing…
The UFE is overwhelmed by the Mars Knights’ advance. Inaho and the Deucalion take part in the fighting, but they find themselves hard pressed by an unexpected attack. Elsewhere, Slaine unburdens himself to Eddelrittuo. A Mars Knight who requested an audience with Princess Asseylum did so with an ulterior motive.
Princess Lemrina is distraught over an unexpected situation, but Slaine tells her that on the contrary, he will use it to his advantage. But deep down, he gradually feels more and more cornered. Elsewhere, the Deucalion’s crew links up with a UFE company that is engaging a powerful enemy. Then, on the front line, Inaho gets out of his Kataphraktos.
Irritated by Slaine’s actions, Count Marylcian works out a new strategy with Count Barouhcruz. Elsewhere, Rayet loses her composure in front of the Mars Knight prisoner, and Inaho deduces her true intentions. Meanwhile, Slaine talks about birds with Eddelrittuo.
At the Vers Empire’s frontline stronghold in Earthspace, Slaine leaves for their base on Marineros Island accompanied by the Stygis Squadron, compound Kataphraktoi. Meanwhile, the Deucalion arrives at the United Forces of Earth’s Trident Base, but some of the soldiers there are not fond of a unit that is equipped with Aldnoah.
While Inaho and the others are carrying out their plan, they encounter Count Saazbaum’s Kataphraktos. Slaine, who had been trying to catch up to Princess Asseylum, finds himself in an unexpected situation. The fierce battle on the snowy field builds in intensity, and then—
Count Saazbaum launches his attack. The UEF meets its offensive in this land of brutal cold. Inaho and the others put together a plan to fight back. Working on his own, Slaine makes his way through the intense fighting to reach the Deucalion.
Seylum thanks Inaho for everything and then leaves. Elsewhere, Slaine learns Count Saazbaum’s true motives. Yagarai gives Capt. Magbaredge Marito’s patient chart. Feelings begin to stir within each of them.
Slaine is interrogated under the assumption that he knows something. Slaine manages to keep silent and not reveal the truth, thinking back to the time he once spent with Princess Asseylum. Meanwhile, Count Saazbaum seems to have ulterior motives of some sort.
Inaho and the others are hard pressed in their fight against the Martian Kataphraktos. But then a mysterious fighter craft appears and joins the battle. Elsewhere, Darzana and her crew hide the damaged assault ship in a dock, and there, they discover a combat mecha of unknown origin.
Rayregalia, ruler of Mars, orders that an investigation be conducted on Earth. Slaine takes advantage of this opportunity to speak with the Martian emperor in person. Elsewhere, the assault landing ship that Inaho and the others are aboard has been sailing on a course to reach United Earth HQ.
Slain has misgivings about the war. However, he has no allies around him and no way of telling who the enemy is. Meanwhile, Inaho is entrusted with a secret request by Seylum as Rayet, who is hiding her own true identity, is on edge.
To complete his plan, the Mars Knight relentlessly pursues Inaho and the others. Inaho is suspicious about the manner in which that knight fights. With backing from Marito’s group, Inaho begins a counteroffensive. Meanwhile, Slaine, unaware of the truth, has been ordered to provide support for the Mars Knight and is out in the field with him.