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Civil war continues to wage on the island nation of Alistria. The Waldrons lead a small arms shop on this island when they receive a large order of rifles from the army. However, this turns out to be a ploy by the colonel who made the order. He uses his ties to the rebel army to have them ransack the shop. Having her husband killed, her daughter taken away and her own left eye lost, Sophia decides to take the only remaining sniper rifle and sets out for revenge.
The Katjvarna Empire and the Kioka Republic are at war, and Katjvarna is currently defending their border against Kioka's attacks. Yatorishino is from an influential family in the empire, and she's taking the high ranking officer exams. To make sure she passes at the top, she's convinced lazy, anti-war, girl-crazy Ikuta to take the exams as well and help her, in exchange for a favor from her family. The first, written test goes as planned, and then they head off on a boat for the next. Unfortunately, the boat sinks, and Yatorishino, Ikuta, some other examinees, and a mysterious, important little girl are stranded behind enemy lines!
Ever since his father passed away, Ikki Kai feels bored by everything and yearns for a change of pace. While on a run through the woods, he meets a man who changes his life forever: this man is part of the Japan Self-Defence Forces. Now the only thing Ikki wants to do is join the JSDF himself. But will he able to survive the harsh trials that await him?