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The Katjvarna Empire and the Kioka Republic are at war. Katjvarna is currently defending their border against Kioka attacks. Yatori is from an influential family in the empire and she is taking the high ranking officer exams. She made a deal with Ikta 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 ship for the next. Unfortunately, the ship sinks and Yatori, Ikuta, some other examinees and a mysterious important little girl are stranded behind enemy lines!