"Girls und Panzer: Little Army II" is a manga series that serves as a prequel to the main "Girls und Panzer" storyline, focusing on the origins of Miho Nishizumi and her early experiences with tankery. The narrative centers on Miho's middle school years at Kuromorimine Girls' Academy, a prestigious institution known for its rigorous tankery program. Miho, a member of the renowned Nishizumi family, is expected to uphold the family legacy of excellence in the sport. However, her reserved and compassionate nature often clashes with the strict, results-driven philosophy of her mother, Shiho Nishizumi, and the school's competitive environment.

The story explores Miho's struggles to reconcile her personal values with the expectations placed upon her. Her relationship with her older sister, Maho, who is a top tankery commander at Kuromorimine, adds depth to the narrative. Maho serves as both a role model and a source of pressure for Miho, as she navigates the challenges of leadership and teamwork. The manga delves into Miho's first experiences commanding a tank crew, highlighting her growth as a leader and her ability to inspire her teammates despite her initial self-doubt.

Key characters include Miho's classmates and teammates, such as Erika Itsumi, a fiercely competitive and ambitious student who often clashes with Miho due to their differing approaches to tankery. The dynamics within Miho's crew, including their struggles to work together and their eventual bonding, form a central theme of the story. The narrative also touches on the broader culture of tankery at Kuromorimine, emphasizing the school's emphasis on discipline, tradition, and victory.

The manga provides insight into the events that shape Miho's decision to leave Kuromorimine and transfer to Oarai Girls' Academy, as depicted in the main "Girls und Panzer" series. It portrays the emotional and psychological toll of the high-pressure environment at Kuromorimine, as well as Miho's desire to find a more inclusive and supportive approach to tankery. Through its exploration of Miho's formative years, "Girls und Panzer: Little Army II" offers a deeper understanding of her character and the motivations behind her actions in the broader franchise.