Year 1205 on the Septian Calendar. North Ambria, the least developed area in northwest Zemuria, is where Lavi was born. To safeguard her community and set herself apart from her grandpa Vlad, a former hero who betrayed North Ambria, she enlists in the Northern Jaegers, the biggest on the continent. Her passion to her missions frequently resulted in her breaking the law, and one day she is asked to create a platoon with Martin, Iseria, and Talion for a challenging espionage mission to Erebonia in order to learn more about the mystery danger to North Ambria known as the "Imperial Hero."