Mysterious living beings named Aragami suddenly appear on Earth and begin to devour everything in sight. Determined to destroy every single Aragami, a youth comes to Fenrir Far East Branch. His name is Lenka Utsugi. Immediately, Lenka and his fellow enlistee, Kota Fujiki, begin rigorous God Eater training under their instructor, Tsubaki Amamiya. Itching to take part in real battles, Lenka’s wish unexpectedly comes true when Aragami infiltrate the Far East Branch. Even as anxiety heightens in the strategy room, Lenka’s resolve grows stronger.

Lenka and Alisa are rescued from a violent attack of Aragami, then taken by Lindow to Asyl (asylum), a place where people who were turned away at the Fenrir Far East Branch refugee center live and support each other. Making the rounds with Lindow, Lenka comes upon a shocking sight. Lenka is unable to answer when Lindow pointedly asks why he wants to destroy Aragami. A Vajra appears and moves threateningly toward Asyl, and Lindow orders Lenka to “Go back and protect everyone. No one is to die...including yourself.

Fifteen years ago, the Utsugi family finds an abandoned baby and decide to take him in. They name the infant Lenka, and he is raised lovingly by his adoptive mother, father and older sister Iroha. They live in Agir, a refugee commune. One day, Lindow Amamiya, a God Eater, appears and encourages everyone to take the patch test. Anyone testing positive is considered to have attributes of a God Eater, and will be allowed into Fenrir, including any blood-related kin. Lenka's father despises this discriminatory method of selection. However...

Operation Meteorite, a plan to lure Aragami with a newly developed guiding device, is critical to the completion of the Aegis Plan. Lenka is unable to join the unit due to adjustments that must be made on his God Arc, but Lindow recommends him to command the advance base camp. Alisa rejoins the unit, but the others seem to feel uncomfortable around her. Operation Meteorite starts successfully, but suddenly the Aragami turn away from the guiding devices and head northwest. Lindow is sent to do reconnaissance and realizes that the Aragami are converging on Asyl, the settlement that Lindow has been helping.