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Yuumi Kondo, a studious high school girl from a humble background, sees her dreams of higher education dashed when her family's diner faces closure due to redevelopment. Her fortunes change upon discovering the National Defense Academy, where not only is education free, but students also receive a stipend. After passing the rigorous entrance exam, Yuumi steps into the challenging world of the Academy, known for its strict discipline and intense training aimed at molding future military leaders. Here, she faces the physical and mental trials of cadet life, forms bonds with unique classmates, and navigates the complexities of leadership, camaraderie, and personal growth.