After arriving at Zuellni Academic City, mysterious Layfon makes quite an impression - and is quickly forced into joining the 17th Platoon of the Military Arts Department.

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.