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.

Zuellni falls into a massive nest of Contaminoids! As Nina leads the Military Arts students into battle, Layfon stays behind, convinced it’s a suicide mission. If he doesn’t join the fight, all could be lost.

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.

Faint signs of life are detected within Gandweria, but as the 17th and 5th Platoons search the ruins for survivors, Shante’s lingering hostilities toward Layfon put everyone in grave danger.

Hostilities grow between Sharnid and the members of his former Platoon. Later, Layfon’s investigation of a drug-dealing operation leads to a confrontation with a mysterious mercenary from Glendan.

Nina confronts Dinn about his Overload use, warning that the authorities might be catching on. Later, Kalian has a mission for Layfon, Nina, and Sharnid - and they’re going to be working with Haia.

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.