The setting is the modern era, at a school for training female officers called 'Army Girls' Junior School.' A girl named Indou Shinobu, who moved from the countryside to the city, encounters the domineering upperclassman Kagami Fujino as soon as she enrolls. Despite her usual arrogant demeanor, Kagami occasionally shows a softer side only to Indou. Indou finds herself drawn to this side of Kagami...