A decade post the epic battle with demon-beasts, the empire reigns supreme through the power of aer. Yuri Lowell and Flynn Scifo, fresh recruits to the esteemed Imperial Knights, embark on a mission to Ceazontania. Here, they face mutated creatures spawned by erratic aer, posing a dire threat to the region. Meanwhile, a power struggle brews between Knights Supreme Commander Alexei Denoia and the guileless Princess Estellise in the capital. With the situation escalating and no aid forthcoming, the Imperial Knights in Ceazontania face a pivotal moment when Commander Niren Fedrok alters the course of Yuri and Flynn's fates. As mysteries unfold around them, can they protect Ceazontania's populace and uphold their convictions in the face of adversity?