在回忆中，当一个巨大的污染獸袭击一个都市时，三个强大的战士挥舞着“天堂之刃”开始对抗它。目前，雷馮·阿爾塞夫离开他的都市参加潔爾妮的学院。与此同时，妮娜·安多克失去了她排的一名成员，并被迫寻找新兵。 雷馮抵达潔爾妮时，两名学生开始战斗，导致另一名学生倒塌。在接到心灵感应命令拯救她之后，雷馮以令人难以置信的速度将她从建筑物中带走。他会见了学生团体的主席卡利安·羅斯，他迫使他进入军事艺术排，目睹雷馮拯救梅珍的妮娜将雷馮招募到第17排。之后，雷馮遇到了菲麗·羅斯，这是第17排的另一名成员，他早些时候向雷馮发送了心灵感应信息。那天晚上，雷馮回忆起他是过去曾对抗巨型林贝肯的战斗机之一。

The 17th and 5th Platoons must work together to investigate a city left in ruins by Contaminoids. During the mission, Gorneo shocks Nina when he reveals information about Layfon’s secret past.

New information shared by Gorneo forces Nina to consider Layfon’s future with the 17th Platoon. Meanwhile, Leerin finds herself in serious danger as a direct result of Layfon’s past.

Nina decides to lead the charge in the competition against the 1st Platoon. Later, when something causes Zuellni to change course and head toward a group of Contaminoids, Layfon must join forces with Haia.

Layfon engages the Contaminoids alongside Haia’s group, and as the battle rages, the rest of the 17th Platoon watches and learns. Unfortunately, Nina is nowhere to be found after her visit to see Zuellni.

After her encounter with the Fallen One, Nina is somehow transported to Myath. Meanwhile, Kalian confronts Layfon, ordering him to rest for the impending battle against the Contaminoids.

Nina and Leerin face great danger and treachery when they take on those coveting Myath’s electronic spirit. Back at Zuellni, Layfon helps turn the tide of battle against the Contaminoids.

With a battle against Myath looming, the 17th Platoon is happy to have Nina back after her mysterious disappearance. Unfortunately, new troubles arise when Felli lands in Haia’s clutches.

Felli’s safety is on the line as Layfon and Haia clash. Later, the battle between Zuellni and Myath looks like it might be postponed when an ominous presence appears in the distance.

An encounter between Zuellni and Glendan seems inevitable, and Myath is still lingering in attack range. Just as tensions reach a boiling point, a new threat appears in the sky.

As Layfon and the others search desperately for the missing Nina, the 17th Platoon is caught in an ambush perpetrated by a villain who has been lurking very nearby.

When the Fallen One possesses Savalis, Layfon might not have the power to survive. Everything he holds dear is on the line - and the fate of Zuellni is in his hands.